Vol.:(0123456789)1 3 Agronomy for Sustainable Development (2023) 43:70 https://doi.org/10.1007/s13593-023-00908-6 RESEARCH ARTICLE Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West African agro‑sylvo‑pastoral systems Eric Vall1  · Boko Michel Orounladji2 · David Berre3 · Mohamed Habibou Assouma4 · Der Dabiré2 · Souleymane Sanogo2 · Ollo Sib4 Accepted: 21 July 2023 / Published online: 9 October 2023 © The Author(s) 2023 Abstract In Western Africa, agro-sylvo-pastoral systems are dominant and food demand is booming. To meet this demand, many farmers intensify the production with industrial inputs (mineral fertilizers, feeds, pesticides, herbicides). However, the price of these inputs is rocketing. To face this issue, some farmers reconsider crops, livestock, and tree synergies and by-product recycling to increase their production sustainably at a lower cost. The study aimed to characterize the diversity of Koum- bia’s farming systems and to assess farming systems’ technical performance in an agroecological perspective. We surveyed 391 farms in the county of Koumbia (Burkina Faso). Considering 15 agricultural practices (4 on by-products recycling, 4 on soil protection, 4 on industrial inputs limitation, 2 on smart use of natural resources, and 1 on cropping diversification), a multivariate analysis (PCA+HAC) combined to an agroecology (Ae) scoring system (−15 to +15) based on 15 specific indicators (one/practice), we highlighted 3 agroecological farming systems clusters. These clusters are distributed along a gradient of agroecology intensity (Ae+: high degree of Ae, Ae+/−: medium degree, and Ae−: poor degree). Ae+ farms (Ae score: +3.0) group 17% of the farms, Ae+/− (Ae score: −4.5) group 58% of the farms, and Ae− (Ae score: −10.5) group 25% of the farms. Ae+ raise more livestock and recycle a higher rate of crop-livestock by-products in fodder, organic manure, and mulch. These recycling practices are facilitated by better levels of equipment for transportation and storage and soil water and crop residue conservation measures, including maintenance of the wooded park on the cultivated fields. This set of practices, which close better the agricultural system, produces a systemic effect which has a positive impact on yields and on the whole ecosystem. Our findings outline for the first time that crop-livestock synergies and by-product recycling are major factors of agroecological transition in agro-sylvo-pastoral systems. Keywords Crop-livestock systems · Fodder storage and conservation · Organic manure · Nutrients and biomasses recycling · Input reduction · Agroecosystem biodiversity · Agroecosystem synergies 1 Introduction African farmers face multiple challenges. There is wide- spread recognition of the need for alternatives to current African agricultural and food systems to ensure they provide diverse and healthy food, support rural livelihoods, and do not degrade even more the environment (HLPE 2019). Agroecol- ogy transition in Africa has been suggested as contributing to solutions to these challenges (Viability Project Team 2023). Agroecology (Ae) is a body of knowledge, practices, and political movements that aim to support the transformation of food and agricultural systems to long-term social and envi- ronmental sustainability (Wezel et al. 2009). Agroecology is grounded in principles that are adapted and implemented in various ways depending on the local context (Wezel et al. * Eric Vall eric.vall@cirad.fr 1 CIRAD, UMR SELMET, F-34398, SELMET, Univ Montpellier, CIRAD, INRAE, Institut Agro, Montpellier, France 2 CIRDES, USPAE, Bobo‐Dioulasso, Burkina Faso 3 CIRAD, UPR AIDA, F-34398, AIDA, Univ Montpellier, CIRAD, Montpellier, France 4 CIRAD, UMR SELMET, Bobo-Dioulasso, Burkina Faso, SELMET, Univ Montpellier, CIRAD, INRAE, Institut Agro, Montpellier, France http://crossmark.crossref.org/dialog/?doi=10.1007/s13593-023-00908-6&domain=pdf http://orcid.org/0000-0001-8231-3083 E. Vall et al. 1 3 70 Page 2 of 16 2020). In agro-sylvo-pastoral systems of Western Africa, crop-livestock by-product recycling, crop-livestock-tree syn- ergies, soil protection, smart use of natural resources, and biodiversification of farming systems are emerging as crucial components for agroecological transition. In the savannah areas of West Africa, agro-sylvo-pastoral systems are overwhelmingly dominant and involve millions of farming households (Séré and Steinfeld 1996; Robinson et al. 2011). In these farming systems, synergies between crops, trees, and animals take on many different forms and vary in inten- sity across farms (Powell et al. 2004; Hendrickson et al. 2008; Vall et al. 2017). These synergies form the basis and hallmark of these systems’ agroecological practices (Debray et al. 2019; Vall et al. 2019). These synergies are longstanding (Landais and Lhoste 1990; Dugué et al. 2004; Powell et al. 2004; Hendrickson et al. 2008). However, given today’s unprecedented rise in human pressure on land, as well as the spread of more inten- sive farming techniques via cotton (row crops, use of herbi- cides and pesticides, mechanized and increasingly motorized farming), and the effects of climate change, they are taking on new forms (Vall et al. 2019). In the past, these synergies were based upon low labor- intensive practices (land left fallow, grazing of crop residues, manure deposit on cropland by livestock night corralling), all of which were viable in a context of low pressure on resources (Landais and Lhoste 1990; Milleville and Ser- pantié 1994). Today, due to increasing competition for spaces and natural resources, they are now being replaced by practices that involve more work, more control, and more investment. Here are some examples of these emerging agri- cultural practices: soil and water conservation measures in the fields; selectively managing tree species; diversifying farm machinery; monitoring the herd movements on pas- ture; improving animal housing; increasing fodder residue storage; developing fodder crops; diversifying animal feed rations; diversifying manure production methods in pens, pits, and biodigesters; managing plant cover on crop plots (Vall et al. 2019; Fig. 1). According to some researchers, they often play a significant role in the sustainability of farming systems (Rudel et al. 2016). Our assumption is that today, agroecology at the farm system level in West African agro-sylvo-pastoral systems is mainly based on new livestock feeding management prac- tices, integrating pasture grazing and stall housing, and on a growing number of crop-livestock by-product recycling processes introduced by farmers. In this paper, we highlight for the first time that crop-live- stock synergies and by-product recycling are major factors for agroecology in West African agro-sylvo-pastoral systems through quantitative metrics. These findings are based on a survey of 391 agro-sylvo-pastoral farms located in western Burkina Faso around Koumbia, in the heart of the country’s cotton-producing area. This paper has two main objectives: • Characterizing the diversity of Koumbia’s farming systems considering 15 agricultural practices related to agroecological principles (4 on recycling of crops and livestock by-products, 4 on soil protection, 4 on limitation of industrial inputs, 2 on smart use of natural resources, and 1 on cropping systems bio- diversification). The 15 agricultural practices were combined to an Ae scoring system based on 15 spe- cific indicators (one/practice; Ae scoring between −15 and +15) in order to identify Ae farming systems clusters; Fig. 1 Fodder storage and accumulation of organic manure under a herd of cattle kept at home. Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West… 1 3 Page 3 of 16 70 • In depth analysis between the Ae farming systems clus- ters: (1) structural characteristics of each Ae farming system cluster; (2) assessing the Ae cluster farming sys- tems’ technical performance; (3) interpret the technical performance of Ae clusters by representing their agro- ecological systemic functioning (recycling of crops and livestock by-products, soil protection, spontaneous use of resources, cropping systems bio-diversification and on limitation of industrial inputs) and taking into account their structural characteristics. 2 Materials and methods 2.1 Study site description The municipality of Koumbia was chosen because it has been documented as a representative area of West African agro- sylvo-pastoral territories (Vall et al. 2006, 2019). Located in the western part of Burkina Faso, in the Tuy province and in the heart of the country’s cotton-producing area, it comprises 14 villages and several farming hamlets (Fig. 2). Fig. 2 Map of the municipal- ity of Koumbia and the farms surveyed during the study. E. Vall et al. 1 3 70 Page 4 of 16 It covers an area of 1358 km2, 30% of which is made up of protected forests. According to the last census, the population is estimated at 46,005 (INSD 2022). The indig- enous people belong to the Bwaba ethnic group. Since the 1980s, the municipality has absorbed a large influx of people from the north of the country (Mossi, Fulani herders, etc.) in search of land, pasture, and more favorable weather condi- tions. The two main economic activities of the population are agriculture and livestock farming. The farming system is rainfed with intermixed/scattered tree cover (Vitellaria paradoxa, Parkia biglobosa, Faidherbia albida), powered by animal traction (with a trend towards motorization), rela- tively input-intensive for cotton, maize, and rice, and with a low level of inputs for other crops (sorghum, millet, ground- nut, cowpea). Cattle, sheep, and goat breeding is based on optimizing the use of spontaneous vegetation on pasture, crop residues, and a few agro-industrial by-products. Stor- ing crop by-products as dry season forage and producing organic manure is becoming increasingly common. In three decades, the population has tripled, resulting in an increase in land being cleared and the end of fallowing, leading to a higher risk of declining soil fertility. As a result of crop expansion, herders are faced with the shrinking of their tra- ditional pastoral areas. The dramatic growth in population density (+380% between 1985 and 2020, during which it rose from 10 to 48 inhabitants/km2 in the legally usable area, i.e., excluding protected forests) has led to fierce competition for agro-sylvo-pastoral resources. It has also increasingly encouraged farmers to recycle agricultural and livestock by- products or to practice transhumance with all or part of their livestock. 2.2 Sample of Koumbia farms studied The survey was conducted among 391 farms in the 14 vil- lages of the municipality of Koumbia, with about 4000 farms, i.e., a sampling rate of around 10%. To consider the diversity and weight of the main types of farms, the sample was reasoned by considering the proportion of the 3 main local types of farms (crop-oriented farms ~ 60%; livestock- oriented farms ~ 20%; and crop-livestock-oriented farms ~ 20%), as well as the area cultivated by the farm (in ha) and the livestock owned by the farm (in TLU knowing that 1 TLU = 1 bovine of 250 kg) as proposed by Vall et al. (2017) in previous studies. Following these criteria, the sample of 391 farms studied is distributed as follows: • 225 crop-oriented farms (58% of farms in the sample) • 70 very small crop-oriented farms (< 5 ha, < 10 TLU) • 101, medium size crop-oriented farms (5-10 ha, < 10 TLU) • 54 large crop-oriented farms (> 10 ha; < 10 TLU) • 78 crop-livestock farms (20 % of farms in the sample; > 10 ha, > 10 TLU) • 88 livestock-oriented farms (22 % of farms in the sample) • 41 small livestock-oriented farms (< 7.5 ha; 10 -29 TLU) • 47 large livestock-oriented farms (< 7.5 ha; > 20 TLU) 2.3 Data acquisition Data was collected in a single-pass survey through a digi- tal questionnaire hosted on the KoboToolBox platform and deployed on the KoBoCollect v2021.3.4 application. Enumerators surveyed farm managers between Septem- ber and October 2021. The reference period for the survey was a full year running from May 2020 to May 2021. A guide was produced to help enumerators fully understand the questions and find the information needed to phrase the answers correctly. On the day of the survey, once the respondents’ consent to the results being published had been secured, the enumera- tors started collecting data on the general characteristics of the farms (farm manager’s ID and contact details, informa- tion about dependants and staff, equipment, tools, and build- ings for farming and livestock), followed by detailed data on the following: • Fields (acreage, facilities, tree density); • Crops (plot size, production, soil preparation, use of organic manure and mineral fertilizers, use of herbicides, soil coverage with crop residues or mulch in the dry sea- son); • Storage of agricultural by-products (quantities and stor- age methods for straw, tops, stalks); • Livestock management in draft cattle, dairy cows, suck- ling cattle, and sheep and goat production units (number of heads/farm, grazing/zero grazing livestock, fodder distribution and feed supplementation, milk production per cow, births, sales, deaths); • Production and use of organic manure (in pits, pens, bio- digesters, or deposit in fields during livestock night cor- ralling). 2.4 Rationale for the agroecological practices considered In order to study the agroecological nature of the farming systems, we focused on the principles of agroecology sug- gested by Wezel et al. (2020) that are more specific to this level of analysis, namely, synergies, recycling, input reduction, Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West… 1 3 Page 5 of 16 70 bio-diversification of the cropping system with pulses, soil health, and animal welfare. As a result, we identified 15 agri- cultural practices implementing these agroecological princi- ples, for which there is still significant room for improvement in the short term, without major structural changes at the farm level to improve the level of agroecology of the farming system: • The recycling of crops and livestock by-products (dung, cotton stalks, cereal straw, legume tops) to produce fod- der, organic manure, and mulch; • Soil protection (ground coverage or mulch, stone barri- ers, grass strips, minimum tillage); • The use of spontaneous vegetation (pastures, wooded areas); • The limited uses of industrial inputs (mineral fertiliz- ers, herbicides, animal feed) and agricultural equipment powered by internal combustion engines; • Cropping system bio-diversification (legumes cultivation) Figure 3 provides the list of all 15 selected practices and a diagram showing the sequence of practices over the course of a year in relation to the main stages in the agricultural calendar. 2.5 Data analysis Each practice has been characterized by a quantitative indi- cator as shown in Table 1 Description of the 15 agricultural practices, indicators, and indicator calculation principles used in this study to score the level of agroecology. 2.5.1 From data to farm groups The complete dataset includes 391 individuals and 36 vari- ables (15 indicators for agricultural practices, 8 variables of farm structures, and 13 performance variables). In order to develop the typology of farming systems considering the 15 agricultural practices considered, a first category of farms with no livestock (zero tropical livestock unit (TLU)) was created. A multivariate analysis based on principal compo- nent analysis (PCA) and hierarchical ascending classification (HAC) was then used to classify the other farms with TLUs. The 25 farms with no livestock (zero TLU) were treated as a separate group. These farms are geared towards small or very small-scale agriculture (according Vall et al. 2017 criteria and typology). Since PCA analysis does not tolerate Fig. 3 Schematic diagram of the agro-sylvo-pastoral system and the 15 agricultural practices selected to assess the agroecological nature of the study area’s production systems. E. Vall et al. 1 3 70 Page 6 of 16 Ta bl e 1 D es cr ip tio n of th e 15 a gr ic ul tu ra l p ra ct ic es , i nd ic at or s, an d in di ca to r c al cu la tio n pr in ci pl es u se d in th is st ud y to sc or e th e le ve l o f a gr oe co lo gy . K ey : T LU , t ro pi ca l l iv es to ck u ni t ( 1 TL U = h ea d of c at tle w ith a li ve w ei gh t o f 2 50 k g) ; O M , o rg an ic m an ur e; D M , d ry m at te r; FC FA , F ra nc C FA ; S W C M , s oi l a nd w at er c on se rv at io n m ea su re s. N o. A gr ic ul tu ra l p ra ct ic es In di ca to rs o f t he a gr ic ul tu ra l p ra ct ic e In di ca to r c al cu la tio n pr in ci pl es 1 M ai nt en an ce o f w oo de d ar ea s o n fie ld s N um be r o f t re es /h a ∑ Fi el ds [ Fi el d (h a) × F ie ld tr ee d en si ty (t re e/ ha ) ] / To ta l a re a of fa rm ’s fi el d (h a) ]; fi el d tre e de ns ity e sti m at ed w ith a 6 st ag es sc or in g sc al e fro m 0 to 2 5 tre es /h a 2 So il an d W at er c on se rv at io n m ea su re s ( sto ne b ar rie rs , g ra ss str ip s, m an ur e pi ts ) Fa rm la nd u nd er S W C M p ra ct ic es (% ) ∑ Fi el ds [ Fi el d w ith S W C M p ra ct ic es (h a) ] / T ot al a re a of fa rm ’s fi el ds (h a) 3 U se o f a gr oe co lo gi ca l t oo ls a nd e qu ip m en t ( dr af t a ni m al po w er to ol s a nd a ni m al s, m an ur e pi ts , f od de r s he ds , bi od ig es te rs ) Pr op or tio n of a gr oe co lo gi ca l t oo ls a nd e qu ip m en t ( % ) ∑ To ol s a nd E qu ip m en t [ V al ue o f a gr oe co lo gi ca l t oo ls a nd e qu ip - m en t ( FC FA ) ] / To ta l v al ue o f f ar m to ol s a nd e qu ip m en t (F C FA ) 4 U se o f p as tu re to fe ed li ve sto ck Fa rm ’s g ra zi ng li ve sto ck (% ) G ra zi ng li ve sto ck (T LU ) / T ot al fa rm ’s L iv es to ck (T LU ) 5 O rg an ic m an ur e de po si te d in c ul tiv at ed a re a by n ig ht -p ar ke d liv es to ck O M d ep os ite d by n ig ht p ar ke d liv es to ck (k gD M ) / c ul tiv at ed ar ea (h a) ∑ pa rk -li ve sto ck u ni ts [ TL U o f n ig ht -p ar ke d liv es to ck × N um be r o f ni gh t × 1 ,4 k gM S. ni gh t− 1 ) / T ot al c ul tiv at ed a re a (h a) 6 M ai nt en an ce o f a m ul ch (c ro p re si du es c ov er ) o n cu lti va te d ar ea a t t he e nd o f t he d ry se as on M ul ch d en si ty (k gD M / h a) ∑ cu lti va te d pl ot s [ P lo t a re a (h a) × M ul ch d en si ty (k gM S/ ha ) ] / To ta l c ul tiv at ed a re a (h a) ; M ul ch d en si ty e sti m at ed w ith a 6 st ag es sc or in g sc al e fro m 0 to 6 tM S/ ha fo r m ai ze , r ic e, a nd pe ar l m ill et st ra w s, 0 to 7 tM S/ ha fo r s or gh um st ra w s, 0 to 2 tM S/ ha fo r c ot to n st al ks — pu ls es : n ot c on si de re d 7 O rg an ic fe rti liz at io n of c ul tiv at ed a re a C ul tiv at ed a re a fe rti liz ed w ith o rg an ic m an ur e (% ) ∑ cu lti va te d pl ot s [ P lo t t ha t h as re ce iv ed O M (h a) ] / T ot al c ul ti- va te d ar ea (h a) 8 C ro pp in g w ith ou t h er bi ci de s C ul tiv at ed a re a w ith ou t a ny h er bi ci de s ( % ) C ul tiv at ed a re a w ith ou t h er bi ci de s ( ha ) / T ot al c ul tiv at ed a re a (h a) 9 M in im um so il di stu rb an ce C ul tiv at ed a re a un de r n o- til l a nd d ire ct se ed in g (% ) C ul tiv at ed a re a un de r n o- til l a nd d ire ct se ed in g (h a) /T ot al cu lti va te d ar ea (h a) 10 C ro pp in g w ith ou t m in er al fe rti liz er s C ul tiv at ed a re a w ith ou t a ny m in er al fe rti liz er s ( % ) C ul tiv at ed a re a w ith ou t m in er al fe rti liz er s ( ha ) / T ot al c ul ti- va te d ar ea (h a) 11 Le gu m e cr op s c ul tiv at io n C ul tiv at ed a re a un de r l eg um e cr op s ( % ) C ul tiv at ed a re a un de r l eg um e cr op s ( ha ) / T ot al c ul tiv at ed ar ea (h a) 12 Fo dd er st or ag e an d pr es er va tio n St or ed fo dd er (k g) / C er ea ls a nd le gu m es c ul tiv at ed a re a (h a) Q ua nt ity o f s to re d pl an t r es id ue s f or li ve sto ck fe ed in g on th e fa rm (k gM S) / To ta l c er ea ls a nd le gu m es c ul tiv at ed a re a (h a) 13 N ou ris hi ng li ve sto ck w ith ou t i nd us tri al fe ed s Fa rm ’s li ve sto ck n ou ris he d w ith ou t f ee d at a ll (% ) Fa rm ’s li ve sto ck n ou ris he d w ith ou t f ee ds (T LU ) / T ot al fa rm ’s li ve sto ck (T LU ) 14 U se o f f or ag es to su pp le m en t l iv es to ck fe ed (c ro ps re si du es + c ul tiv at ed fo ra ge s) Fa rm ’s li ve sto ck re ce iv in g fo ra ge s ( % ) Fa rm ’s li ve sto ck re ce iv in g fo ra ge s ( TL U ) / T ot al fa rm ’s liv es to ck (T LU ) 15 O rg an ic m an ur e pr od uc tio n in p en s, pi ts , b io di ge ste rs fo r cu lti va te d ar ea O M p ro du ce d (k gD M ) / c ul tiv at ed a re a (h a) [O M pr od uc ed in p en s + O M pr od uc ed in p its + O M pr od uc ed in b io di ge ste rs (k gD M ) ] / To ta l c ul tiv at ed a re a (h a) Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West… 1 3 Page 7 of 16 70 missing data, indicators 4, 13, and 14 in Table 1 (% of TLUs grazing, % of TLUs receiving feed, % of TLUs receiving fodder) could not be measured as the total number of TLUs was in the denominator to calculate these ratios. This is why we classified them separately. A PCA followed by an HAC was carried out based on the remaining 366 farms considering the 15 agricultural practices. The PCA and HAC enabled to define 6 groups of farming systems considering these agricultural practices. Subsequently, the 391 (366 + 25) farms were split into 7 (1 + 6) groups of farming systems considering the 15 agricultural practices. We performed variance analyses (ANOVA) using XLSTAT (XLSTAT, version 2019.4.1.63353) to examine the significance of differences among the seven groups in relation to the 15 agricultural practices of the PCA. Whenever a significant difference was found (p < 0.05), it was followed by a Newman Keuls test. 2.5.2 From farm groups to agroecological farming system clusters To establish an agroecological (Ae) clustering of farms groups, we used the following Ae scoring system: 1) For a given indicator (i: 1 to 15) for a given farm group (G1 to G7), its value ( IndicG i ) was compared to the aver- age of the indicator i of the 7 farm groups ( Indic i ) 2) The value 1 or 0.5 or −1 has been assigned to “i” depending on the position of IndicG i with respect to Indic i : • 1 if IndicG i > 1.05 × Indic i • 0.5 if Indic i < IndicG i < 1.05 Indic i • −0.5 if 0.95 × Indic i < IndicG i < Indic i • −1 if IndicG i < 0.95 × Indic i In this way, it can be defined for a farm group whether an indicator value is significantly above or below a median zone (between 0.95 and 1.05 around the mean). 3) Scoring Ae: For a given farm group (Gx), the sum of the 15 indicators converted into a score (1; 0.5; −0.5; −1) establishes a score between −15 and + 15 which we interpret as a score of agroecology in the sense that it reflects the effort deployed to implement the 15 prac- tices. The closer the score is to 15, the more the farm is agroecological, and the closer the score is to −15, the less it is. This Ae score has a local value and does not claim to qualify in absolute terms the Ae character of an agricultural system. 4) Ae clustering: The groups (G1 to G7) were then grouped into Ae clusters based on the proximity of their Ae scor- ing (Ae+; Ae+/−; and Ae−). 2.5.3 In‑depth analysis of the Ae farming system clusters We characterized the structural features of each agroecologi- cal farming system cluster using eight structure variables (cultivated area in ha, livestock in TLU, number of family members, number of family assets, number of employees, assets/ha, total value of agricultural equipment in FCFA, value of agroecological equipment in FCFA). We assessed the technical performances of each agro- ecological farming system clusters using thirteen technical performance variables: yields for each of the 12 crops (in kg/ ha: cotton, maize, red sorghum, white sorghum, millet, rice, groundnut, cowpea, bambara groundnut, soya, sesame) and average milk yield (in l/cow/d). We performed variance analyses to test the significance of the differences between the 3 Ae clusters on the eight structure variables and the thirteen technical performance variables. Whenever a significant difference was found (p < 0.05), it was followed by a Newman Keuls test. Ultimately, we sought to explain the performance of each Ae farming system cluster considering their struc- tural characteristics and considering the intensification of synergies between the agro-sylvo-pastoral components of the system and by the establishment of more intense recycling processes often activated by the presence of livestock. To this end, we have schematized on figures the agroecological functioning of each agroecological farm- ing system clusters (recycling of crops and livestock by- products, soil protection, spontaneous use of resources, cropping system bio-diversification and on limitation of industrial inputs). These diagrams represent the key ele- ments of the Ae farming system cluster, completed with the data of each agricultural practices (means and stand- ard deviation). 3 Results and discussion 3.1 A minority of farms standing at the top of an agroecology intensity gradient A description of the 3 clusters of agroecological farming systems (Ae+, Ae+/−, and Ae−) based on 391 farms and their agricultural practices is presented in Table 2. In Table 2, we arranged all 7 groups of farming systems according to an agroecology intensity gradient developed using the Ae scoring system proposed in the methodol- ogy. According to this system, groups G4 and G6, which respectively present Ae scoring of +4.5 and +1.0 (i.e., +3.0 weighted Ae score), are at the top of the agroecologi- cal gradient and constitute the Ae+ cluster (17% of farms). The G3 group, on the other hand, has the lowest Ae scoring (−10.5) and constitutes the Ae− cluster (25% of the farms). E. Vall et al. 1 3 70 Page 8 of 16 Ta bl e 2 O ve rv ie w o f t he 7 fa rm g ro up s an d th e 3 ag ro ec ol og ic al fa rm in g sy ste m c lu ste rs a rr an ge d (f ro m le ft to r ig ht ) f ro m le as t a gr oe co lo gi ca l ( A e− ) t o m os t a gr oe co lo gi ca l ( A e+ ) f ar m in g sy ste m s. K ey : T LU , t ro pi ca l l iv es to ck u ni t ( 1 TL U = h ea d of c at tle w ith a li ve w ei gh t o f 2 50 k g) ; O M , o rg an ic m an ur e; D M , d ry m at te r; a, b , c , d , e : o n th e sa m e lin e, v al ue s w ith d iff er en t l et te rs ar e st at ist ic al ly d iff er en t a nd p < 0 .0 01 . ( 1) F or G 7, in di ca to rs 4 , 1 3, a nd 1 4 w er e no t c al cu la te d be ca us e th es e fa rm s h av e no li ve sto ck ; ( 2) sc or in g ca lc ul at ed o n 12 in di ca to rs (1 , 2 , 3 , 5 , 6 , 7 , 8 , 9, 1 0, 1 1, 1 2, a nd 1 5) ; N B , a n A e sc or e ca n al so b e ca lc ul at ed b y co ns id er in g th e 15 in di ca to rs , w ei gh tin g th e sc or es b y th e nu m be r o f i nd ic at or s en te re d (1 2 fo r i nd ic at or s 4, 1 3, 1 4) a nd 1 5 fo r th e ot he rs . T hi s c ha ng es th e A e sc or in g va lu e of th e fa rm g ro up . H ow ev er , t ha t d id n ot c ha ng e th e cl us te rin g. (3 ) N um be r o f o cc ur re nc es In d ic G i > 1 .0 5 × In d ic i ; (4 ) n um be r o f o cc ur re nc es In d ic i < In d ic G i < 1 .0 5 × In d ic i ; (5 ) N b oc cu rr en ce s 0. 95 × In d ic i< In d ic G i < In d ic i ; (6 ) N b oc cu rr en ce s In d ic G i < 0 .9 5 × In d ic i ; sc or in g fo rm ul a: A e+ (c oe f. + 1) + 0 .5 × A e+ (c oe f + 0. 5) − 0 .5 × A e− (c oe f. − 0. 5) – A e− (c oe f. − 1) . Fa rm g ro up G 3 G 5 G 1 G 2 G 7 (1 ) G 6 G 4 M ea ns Pr > F (m od el ) N um be r o f f ar m s U ni ts 97 13 0 57 15 25 28 39 N ° A gr ic ul tu ra l p ra ct ic e In di ca to r 1 M ai nt en an ce o f w oo de d ar ea s o n fie ld s N um be r o f t re es /h a 9 c 11 b c 10 c 11 b c 10 c 14 b 16 a 11 .3 < 0 .0 01 2 So il an d W at er c on se rv at io n m ea su re s Fa rm la nd u nd er S W C M p ra ct ic es (% ) 28 b 49 b 23 b 21 b 37 b 39 b 86 a 41 < 0 .0 01 3 A gr oe co lo gi ca l t oo ls a nd e qu ip m en t Pr op or tio n of a gr oe co lo gi ca l t oo ls a nd eq ui pm en t ( % ) 56 b c 63 a bc 73 a 52 c 32 d 78 a 70 a b 62 < 0 .0 01 4 U se o f p as tu re to fe ed li ve sto ck Fa rm ’s g ra zi ng li ve sto ck (% ) 98 a 88 a 90 a 49 b – 94 a 97 a 91 < 0 .0 01 5 O M d ep os ite d by n ig ht -p ar ke d liv es to ck O M d ep os ite d by n ig ht p ar ke d liv es to ck (k gD M ) / c ul tiv at ed a re a (h a) 79 5 b 36 9 b 41 0 b 18 4 b 68 9 b 49 61 a 96 5 b 88 2 < 0 .0 01 6 M ul ch o n cu lti va te d ar ea a t d ry se as on en d M ul ch d en si ty (k gD M / ha ) 15 06 b 11 29 b 12 99 b 13 18 b 10 54 b 14 20 b 33 55 a 14 93 < 0 .0 01 7 O rg an ic fe rti liz at io n of c ul tiv at ed a re a % o f c ul tiv at ed a re a 38 d 69 b 31 d 57 b c 29 d 90 a 48 c d 52 < 0 .0 01 8 C ro pp in g w ith ou t h er bi ci de s C ul tiv at ed a re a w ith ou t a ny h er bi ci de s (% ) 0 b 1 b 1 b 15 a 1 b 1 b 3 b 2 < 0 .0 01 9 M in im um so il di stu rb an ce C ul tiv at ed a re a un de r n o- til l a nd d ire ct se ed in g (% ) 0 b 0 b 0 b 2 b 21 a 0 b 0 b 1 < 0 .0 01 10 C ro pp in g w ith ou t m in er al fe rti liz er s C ul tiv at ed a re a w ith ou t a ny m in er al fe rti liz er s ( % ) 23 d e 15 e 68 a 37 b c 39 b c 29 c d 48 b 31 < 0 .0 01 11 Le gu m e cr op s c ul tiv at io n C ul tiv at ed a re a un de r l eg um e cr op s ( % ) 13 c 13 c 50 a 31 b 28 b 14 c 24 b 21 < 0 .0 01 12 Fo dd er st or ag e an d pr es er va tio n St or ed fo dd er (k g) / cu lti va te d ar ea (h a) 29 5 bc 50 3 b 66 6 b 47 1 b 87 c 19 84 a 35 6 bc 53 9 < 0 .0 01 13 N ou ris hi ng li ve sto ck w ith ou t f ee d Fa rm ’s li ve sto ck n ou ris he d w ith ou t f ee d at a ll (% ) 94 a b 72 d 83 c 91 b – 81 c 78 c d 83 < 0 .0 01 14 U se o f f or ag es to su pp le m en t l iv es to ck fe ed Fa rm ’s li ve sto ck re ce iv in g fo ra ge s ( % ) 19 b 36 a 33 a 18 b – 31 a 32 a 29 < 0 .0 01 15 O rg an ic m an ur e pr od uc tio n in p en s, pi ts , bi od ig es te rs O M p ro du ce d (k gD M )/c ul tiv at ed a re a (h a) 39 2 b 64 5 b 66 4 b 61 7 b 98 5 b 27 57 a 77 6 b 77 0 < 0 .0 01 A e sc or in g an d cl us te rin g fa rm g ro up s ( 2)   A e+ (c oe f. + 1) (3 ) 0 2 4 4 4 6 8   A e+ (c oe f. + 0. 5) (4 ) 1 2 0 0 0 0 0   A e− (c oe f. − 0. 5) (5 ) 0 0 0 1 1 2 1   A e− (c oe f. − 1) (6 ) 11 8 8 7 7 4 3 A e sc or in g/ fa rm g ro up − 10 .5 − 5. 0 − 4. 0 − 3. 5 − 3. 5 1. 0 4. 5 A e fa rm in g sy ste m c lu ste rs /fa rm g ro up A e- A e+ /− A e+ /− A e+ /− A e+ /− A e+ A e+ A e sc or e w ei gh te d of th e cl us te r − 10 .5 − 4. 5 + 3. 0 A gr oe co lo gi ca l i nt en si ty g ra di en t A e− < -- -- -- -- -- -- -- -- --A e+ /− -- -- -- -- -- -- -- -- -- -- -- > A e+ Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West… 1 3 Page 9 of 16 70 The other groups G7, G2, G1, and G5, which respectively present Ae scoring of −3.5, −3.5, −4.0, and −5.0 (i.e. −4.5 weighted Ae score), constitute the intermediate cluster (Ae+/−: 58% of the farms). 3.1.1 Elements of discussion on the agroecological character of the three Ae clusters Within the Ae+ cluster, the following agricultural practices contribute to the agroecological character of the system, with metrics that are very often significantly above aver- age: (1) intensive storage of crop by-products for fodder purposes (agricultural practices N°12 and 14); (2) inten- sive and diverse methods of producing and using organic manure (N°5, 7 and 15); (3) higher use of spontaneous pasture to feed grazing livestock (N°4); (4) more densely grown wooded areas (N°1); (5) higher levels of cultivated area under soil and water conservation measures (field manure pits, grass strips, stone barriers; N°2); (6) higher levels of agroecological equipment and buildings (animal traction equipment, fodder sheds, organic manure produc- tion equipment; N°3); (7) higher cultivated areas under pulse crops (N°11). (8) higher cultivated areas crop without min- eral fertilizers (N°10); (9) ticker mulch coverage in the dry season on cultivated areas (N°6). The first two blocs of practices that underpin the combi- nation between agriculture and livestock farming in agro- pastoral systems (storage of crop residues and use of organic manure) are well-known and recognized as important con- tributors to the intensification, resilience, and sustainability of mixed agro-pastoral systems (Schiere et al. 2002; Debray et al. 2019; Ayantunde et al. 2020; Rufino et al. 2021). They imply the simultaneous presence on the farm of significant numbers of animals and cultivated plots, which is why they are found on farms where these two activities are well developed. However, our study provides new elements for character- izing Ae+ farming systems in the agro-sylvo-pastoral con- text of the West African savannahs: 1. The first one refers to the attention paid by Ae+ farm- ers to maintain on the cultivated fields a high density of wooded areas and a high level of soil and water con- servation measures, to use intensively Ae agricultural tools, and to maintain a thick mulch on the cultivated areas. Incidentally, this last point somewhat flies in the face of conventional thinking regarding the theoretical conflict between livestock farming and plant cover, since it seems that these farmers are able to manage the trade- offs between optimizing the use of crop residues as a forage resource and soil coverage (Andrieu et al. 2015; Diarisso et al. 2016); 2. The second one relates to the livestock farming system’s intensification in terms of animal feeding. The feeding system does not involve giving up grazing in favor of feed as some theories have suggested (Rufino et al. 2021), but instead simultaneously maintains grazing, a sustained use of stored dry fodder crop residues (straws and tops), and the use of animal feed within the Ae+ farms cluster. 3.1.2 Elements of discussion on the method used to develop the agroecological clusters On the theoretical level, the suggested agroecology intensity gradient is admittedly somewhat simplistic since no thresh- old values are included in the indicators. Yet, it is quite pos- sible that above and below threshold values, which remain to be defined, the increase or decrease in practices would become detrimental to the farming system. For instance, an excessive density of trees on the plots would make farm- ing impossible; the total absence of grazing would seriously harm the well-being, nutritional status, and health of the ani- mals; excessive organic manure or storage of fodder residues would lead to waste; the total absence of mineral fertilizers would be detrimental to the maintenance of soil fertility in the region. Consequently, for indicators that can vary from 0 to ∞ (trees/ha, kg manure per ha, kg stored fodder per ha, kg mulch/ha), we checked that the maximum values remained at commonly accepted levels, which is the case. For indicators expressed in % (developed fields, Ae equipment ownership rate, share of livestock receiving pasture, fodder or feed, area under no-till, under legumes, treated with mineral fertilizers, organic manure, herbicides), no published data is available. We have, therefore, taken the view that the greater the %, the stronger the Ae nature of the system. On a practical level, the method used to classify a large batch of farms (about 400) in 3 homogeneous Ae clusters with respect to 15 agricultural practices whose intensity increases the agroecological char- acter of the system, by combining a multivariate analysis (ACP+ CAH) to an Ae scoring system, has proven to be effective and simple to implement. Moreover, the clustering was not affected by the number of indicators filled in (12 or 15). This is a positive point for the method, because it makes it possible to deal together with farms which do not have the same lists of agricultural practices. 3.2 In‑depth analysis of agroecological farming system clusters 3.2.1 Structural features of the agroecological farming system clusters The structural characteristics of each Ae cluster (Ae+, Ae+/−, and Ae−) are presented in the Table 3. E. Vall et al. 1 3 70 Page 10 of 16 These structural data provide three major pieces of infor- mation on the three Ae clusters. First, livestock farming is significantly more prominent in Ae+ cluster compared to Ae−, and Ae+/− (respectively, 36, 26, and 13 TLUs/farm). Second, the level of Ae equipment and buildings (animals and animal power equipment, fodder storage buildings, organic manure production infrastructure) is significantly higher in Ae+ farms, compared to Ae+/− and Ae− ones (respectively, 1006 vs 726 and 675 kFcfa/farm). Thirdly, Ae+ workforce/ha ratio (1.45) is significantly higher than the ratio of Ae− (1.12) and Ae+/− (1.02). This reflects a trend towards a larger labor force in the Ae+ farming system cluster. In terms of cultivated area, Ae+ has a lower value com- pared to Ae− and Ae+/− (respectively, 7.0 vs 8.5 and 9.1 ha) as it is mostly made up of livestock-oriented farmers. Farms with the largest cotton plots are found on the Ae− (39% of the cultivated area) and Ae+/− (40%) clusters side, and only 27% for Ae+. This importance of cotton among the Ae- and Ae+/− explains why these farmers use more mineral fer- tilizers than the Ae+, as the cotton company provides it in advance at the beginning of the cropping season. Ae+ farms have larger cultivated areas under other cereals (13% of the cultivated area in sorghum, millet, rice) and legumes (26%) compared to Ae− (7% for other cereals and 15% for pulses) and Ae+/− (6% for other cereals and 21% for pulses). In terms of “number of family members” and “hired agri- cultural workers and shepherds,” there are no differences between the 3 clusters. Some authors argue that in savannah areas, agroecology is often adopted for want of anything better by farmers with little capital (livestock, land) and limited financial means, in other words, with only their own labor power to draw upon (Djamen Nana et al. 2015; Koutou et al. 2016; Berre et al. 2022). Our findings tend to show the opposite. Within the study area, the most agroecological farmers (Ae+) are in fact those who rear the most livestock, use the most agricultural Ae tools and equipment, and have a workforce (familial and hired) of comparable size to other clusters; in other words, they belong to the most affluent segment of the population. These are actually proactive farmers who optimize syner- gies between agriculture and livestock farming. Ouédraogo (2012) offered a similar conclusion in an ex-ante assess- ment on the uptake of conservation agriculture in the same region, in which his results showed that crop-livestock- oriented farmers were most prone to embrace this practice Table 3 Structural characteristics of the 3 agroecological farming systems clusters. Key: a; b; c; d: on the same line, values with dif- ferent letters are statistically different and p < 0.05; 1 USD = 574 FCFA; Av (average values), figures in regular type; S. D. (standard deviation), figures in italics. Agroecological farming system clusters Ae− Ae+/− Ae+ Average Pr > F (model) Number of farms U 97 227 67 Livestock TLU Av. 26 b 13 c 35 a 20 <0.0001 S.D. 30 23 54 33 Cultivated area ha Av. 8.5 a 9.1 a 7.0 a 8.6 0.134 S.D. 7.9 7.7 7.1 7.6 Cotton field area % 39% a 40% a 27% b 38% <0.0001 Maize field area % 39% a 33% b 36% a 35% <0.0001 Other cereals field area % 7% b 6% b 13% a 7% <0.0001 Legume field area % 15% b 21% a 26% a 20% 0.004 Family members U Av. 12 a 13 a 13 a 13 0.682 S.D. 8 9 9 8 Number of family workers U Av. 6 a 7 a 6 a 7 0.445 S.D. 5 5 6 5 Hired agricultural workers & shepherds U Av. 0.3 a 0.2 a 0.4 a 0.3 0.061 S.D. 0.5 0.6 0.7 0.6 Number of workers/cultivated ha U/ha Av. 1.12 b 1.02 b 1.45 a 1.12 0.001 S.D. 0.86 0.72 1.07 0.84 Value of equipment & agricultural buildings FCFA Av. 1 408 041 a 1 345 617 a 1 613 955 a 1 407 084 0.463 S.D. 1 564 743 1 452 668 1 848 177 1 553 432 Value of non-Ae equipment & buildings FCFA Av. 732 990 a 619 383 a 607 463 a 645 524 0.703 S.D. 1 320 647 1 088 912 1 294 313 1 184 266 Value of Ae equipment & buildings FCFA Av. 675 052 b 726 233 b 1 006 493 a 761 560 0.001 S.D. 427 215 528 625 959 911 612 935 Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West… 1 3 Page 11 of 16 70 because of the means at their disposal (equipment, livestock, workforce). Now the reasons why Ae+ farms are in the minority in the study area (17% of farms) become clearer. This distri- bution between Ae+, Ae+/−, and Ae− farms is primarily due to the fact that the Ae+ group includes a large propor- tion of farms with above-average financial resources that have been able to invest in equipment and livestock, and we know that there are few of these wealthier farms in the area (Vall et al. 2006, 2017, 2019; Berre et al. 2022). It is also possible that the large-scale promotion, over the past 50 years, of a conventional intensification model of cotton farming, (intensification based on inputs that are relatively easy to acquire via input credit schemes; Ripoche et al. 2015), has led to a majority of farmers to 1) disregard value-adding practices using crop and live- stock by-products recycling; 2) invest little in the soil and water conservation measures and in the maintenance of wooded areas in the cultivated areas. Our data clearly shows that the farmers most focused on cotton production stand mainly on the Ae− and Ae+/− clusters side (see Table 3). While some, perhaps many, may not have done so due to lack of resources. There is little doubt that many of the farmers have been influenced by this development model, which seeks to solve everything through the use of inputs and to disregard the potential offered by the many different recycling practices. Lastly, it is possible that Ae+ farms were more affected by R&D programmes focused on optimizing synergies between crops, livestock, and trees, because these larger farms, led by active managers labeled as “champions,” were more targeted by R&D projects. 3.2.2 Technical performances of the agroecological farming system clusters Some technical performances of each Ae clusters (Ae+, Ae+/−, and Ae−) are presented in Table 4. For all crops, the yields of Ae+ cluster (in kgDM/ha of grain) are higher than average and, therefore, higher than Ae− and Ae+/− clusters, but the difference is only significant for maize, millet, and cowpeas due to intra-cluster yield heterogeneity. For milk production, the yield (in l/cow/day) of Ae+ is significantly higher compared to Ae−, and Ae+/−. We, therefore, sought to explain why Ae+ farms perform better. 3.2.3 Livestock contribution to crop‑livestock by‑product recycling, a major factor for agroecology Figure 4 shows the synergies between the 15 agricultural prac- tices studied, their level of intensity, and the crop-livestock by-product flows they generate in the 3 Ae clusters. The better technical performance of the Ae+ cluster can be explained by a combination of systemic and structural factors. 1. Compared to Ae− and Ae+/− farms, Ae+ farms call upon more labor (the number of workers per hectare is significantly higher) for additional tasks such as trans- port, conditioning and use of fodder and manure, and livestock herding and feeding. But the difference is not substantial and is mainly provided by the family work- force (which does not increase costs but can sometimes draw young people away from school). Ae+ farms also call upon more agroecological equipment, buildings, and energy sources (draft animals, animal power equipment, fodder sheds, manure pits), which require additional financial resources; 2. Ae+ farms store and produce significantly more fodder and organic manure due to their larger livestock popula- tions, greater infrastructure for storage and production of organic manure, and more diversified organic manure production practices (field grazing, or production in pits, pens, biodigesters); 3. Ae+ farms invest more in the development of their fields and in ensuring a better organic and water status of the soil through more densely grown wooded areas (which increases root turnover and rhizodeposition), through the implementation of a greater number of small-scale soil and water conservation measures in the fields (compost pits at field edges, grass strips, and stone barriers) that reduce water and nutrient runoff, and through better soil protection with thicker mulch on cultivated area; 4. Ae+ farms use fairly similar (although slightly lower) amounts of synthetic inputs (mineral fertilizers, herbi- cides) compared to Ae− and Ae+/− farms, while still using local resources such as spontaneous grazing for livestock feed, as well as part of the crop residues to cover and protect cultivated land. 5. Lastly, Ae+ farms’ livestock management methods combine mobility under the supervision of shepherds over the territory (through daily grazing on commu- nity rangelands and harvested fields) with time-lim- ited stall housing, allowing for better control of fod- der and feed distribution, and greater dung recovery. With this type of livestock farming, a larger share of spontaneous or cultivated plant biomass (natural hay and crop residues stored, then provided as fodder to livestock in stalls) and dung (to produce manure) can be optimized. It, therefore, appears that livestock farming that com- bines grazing and stall housing and the spread of farm- wide storage and recycling devices for livestock and crop by-products (fodder sheds, pits, pens, biodigesters, wooded areas) and devices aimed at slowing down water and nutrient runoff (stone barriers, grass strips, small dikes) are good catalysts for agroecology in these West E. Vall et al. 1 3 70 Page 12 of 16 African agro-sylvo-pastoral systems. These new forms of livestock farming and crop-livestock by-products recy- cling emerge as important agroecological levers that bring into play the biotechnical principles of recycling, and syn- ergy, which lie at the heart of agroecology at production system level (Wezel et al. 2020). Ae+ farms look promising in terms of production perfor- mance (yields, Table 4), recycling of livestock and crops by- products, and soil fertility maintenance. But they are still few and far between, and it seems appropriate to raise the question as to what would happen if Ae+ systems were to spread widely. The food system would undoubtedly benefit. By providing better yields, local production would increase, which in turn would help to improve food self-sufficiency in West African countries, without increasing production costs since the level of input use in such systems is more or less unchanged, and the additional workforce is family-based. However, for good governance and sustainable manage- ment of natural resources in the territories, the unbridled increase in livestock numbers could quickly become a prob- lem if pastoral resource management practices and live- stock mobility are not regulated or even gradually reformed. Uncontrolled livestock expansion would indeed soon lead to multiple problems in terms of meeting the food and nutritional needs of the animals, and uncontrolled grazing would have detrimental effects on spontaneous vegetation and soils (reduction in vegetation density, increased soil erosion by wind and water) (Ibrahim et al. 2010; Berre et al. 2021). The management of livestock and agricultural activ- ities in open shared areas is not straightforward and can potentially lead to conflicts (Vall et al. 2011; Koutou et al. 2016). The challenge would be to develop livestock farming while controlling livestock mobility with rules recognized by the population and maintaining balanced livestock/crop ratios at farm and territory levels in order to produce fodder in sufficient quantity and quality, as well as a significant quantity of quality manure (Vall et al. 2015). Regarding ecosystem health, the fact that ruminant livestock farming and organic manure production pro- cesses are important sources of greenhouse gas emissions should also be considered, especially if these systems are kept wide open and if the provided feed rations are highly methanogenic. To mitigate this, innovation would be needed in order to develop more enclosed and, therefore, more efficient manure production systems (such as biodi- gesters) as well as feeding practices based on optimizing the use of fodder resources, with a focus on more digest- ible and less methanogenic resources. This would optimize Table 4 Crop yields and milk yields of the 3 agroecological farming systems clusters. Key: a; b; c; d: on the same line, values with different letters are statistically different and p < 0.05; 1 USD = 574 FCFA; Av (average values), figures in regular type; S. D. (standard deviation), figures in italics. Cluster of agroecologi- cal farming systems Ae− Ae+/− Ae+ Average Pr > F (model) Cotton Kg/ha Av. 1037 a 1045 a 1119 a 1052 0.595 S.D. 340 279 473 321 Maize Kg/ha Av. 1789 b 2268 b 3241 a 2 312 0.008 S.D. 745 1877 6104 2 944 Red sorghum Kg/ha Av. 715 a 777 a 1048 a 819 0.333 S.D. 491 748 824 699 White sorghum Kg/ha Av. 688 a 775 a 1163 a 877 0.085 S.D. 546 322 1234 768 Millet Kg/ha Av. 735 b 823 b 1250 a 908 0.003 S.D. 418 432 589 505 Rice Kg/ha Av. 1745 a 2141 a 2666 a 2 168 0.314 S.D. 1157 1265 2765 1 668 Groundnut Kg/ha Av. 753 a 765 a 828 a 773 0.805 S.D. 569 489 498 506 Cowpea Kg/ha Av. 273 b 437 a 473 a 412 0.006 S.D. 143 305 275 283 Bambara groundnut Kg/ha Av. 769 a 360 a 796 a 560 0.248 S.D. 667 292 885 585 Soya Kg/ha Av. 780 b 833 b 1071 a 856 0.151 S.D. 382 524 1 001 595 Sesame Kg/ha Av. 246 a 374 a 348 a 335 0.402 S.D. 313 328 368 333 Milk l/cow/day Av. 0.4 b 0.2 c 0.8 a 0.4 <0.0001 S.D. 0.5 0.4 1.5 0.8 Crop‑livestock synergies and by‑products recycling: major factors for agroecology in West… 1 3 Page 13 of 16 70 Fig. 4 Schematic diagram of farming system with high (Ae+), medium (Ae+/−), and poor (Ae−) level of agroecology (key: arrow thickness is proportional to the intensity of crop-livestock by-products flows). E. Vall et al. 1 3 70 Page 14 of 16 the role of ruminant livestock farming in GHG emission mitigation strategies in agro-sylvo-pastoral areas (Diogo et al. 2013; Assouma et al. 2019). 4 Conclusion The findings of this study show, for the first time, that crop- livestock synergies and by-product recycling are major fac- tors for agroecology of agro-sylvo-pastoral systems. Evi- dence are made through quantitative metrics based on a large farm sample. The method used to analyze the diversity of farming sys- tems and to characterize Ae clusters is easy to replicate in other situations: on other agricultural systems, with other sets of agricultural practices, on a territory of comparable dimension. The basis of this approach lies in identifying a concise and meaningful set of quantitative indicators for agricultural practices. When these indicators are imple- mented effectively, they have the potential to enhance the agroecological nature of the agricultural system. In the agro-sylvo-pastoral context of Western Africa Savannah, the most agroecological agricultural systems (Ae+) are characterized by the importance of livestock, by its multiple functions in recycling and recovering crops and livestock by-products in fodder, organic manure, and mulch. These recycling practices are facilitated in Ae+ farms com- pared to Ae− and Ae+/− farms by better rates of equipment and tools for transport and storage of crops and livestock by-products, by better soil water and crops residues conser- vation measures, and by better maintenance of the wooded park on the cultivated fields. This set of practices which tend to close the system produces a systemic effect which has a positive impact on agricultural yields and on the whole ecosystem (with a possible improvement of the C and water balance that would need further research to be proven). However, Ae+ farming systems, although promising, are still marginal today (17% in the study area). Their expansion and replication, which could bring benefits to food systems, would also give rise to additional challenges related to sus- tainable resource management, governance in the territories, and viability. These challenges are key issues that call for further research to better understand the current dynamics and propose sustainable solutions. Acknowledgements All the authors acknowledge the partners of the ASAP platform (https:// www. dp- asap. org/) and also thank the farmers for their collaboration in this study. Authors' contributions All authors contributed to the study’s concep- tion and design. Survey preparation was performed by Eric Vall and Ollo Sib, David Berre, Der Dabiré, Mohamed Habibou Assouma, and Souleymane Sanogo. Data collection was performed by Michel Oroun- ladji and three enumerators. Data analysis by Eric Vall, Michel Orounl- adji, David Berre, Habibou Assouma, Der Dabiré, Souleymane Sanogo, and Ollo Sib. The first draft of the manuscript was written by Eric Vall, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. Funding The research leading to these results received funding: i) from the Transformative Partnership Platform on agroecological approaches to building the resilience of livelihoods and landscapes, Project Viabil- ity “Documenting and evaluating the socioeconomic viability of agro- ecological practices across Africa”. Supported by French funding and co-ordinated by the agroecology research priority of the CGIAR pro- gramme on Forests, Trees, and Agroforestry (FTA) of which CIRAD is a managing partner; ii) and from the project “Transformational Agro- ecology Across Food, Land and Water Systems Initiative” supported by the CGIAR. Availability of data and material The datasets generated and/or ana- lyzed during the current study are available from the corresponding author on a reasonable request. Code availability Not applicable Declarations Ethics approval The manuscript does not contain clinical studies or patient data. Consent to participate Verbal informed consent was obtained prior to the interview of the Koumbia farmers. Consent for publication The interviewed farmers have consented to the submission of the results of this study to the journal. Competing interests The authors declare no competing interests. Open Access This article is licensed under a Creative Commons Attri- bution 4.0 International License, which permits use, sharing, adapta- tion, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. 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