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    Variation and covariation in strongyle infection in East African shorthorn zebu calves

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    Authors
    Callaby, R.
    Hanotte, Olivier H.
    Wyk, I.C. van
    Kiara, Henry K.
    Toye, Philip G.
    Mbole-Kariuki, Mary N.
    Jennings, A.
    Thumbi, S.M.
    Coetzer, J.A.W.
    Bronsvoort, B.M. de C.
    Knott, S.A.
    Woolhouse, M.E.J.
    Kruuk, L.E.B.
    Date
    2015-03
    Language
    en
    Type
    Journal Article
    Review status
    Peer Review
    Accessibility
    Open Access
    Metadata
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    Citation
    Callaby, R., Hanotte, O., Wyk, I.C. van, Kiara, H., Toye, P.G., Mbole-Kariuk, M.N., Jennings, A., Thumbi, S.M., Coetzer, J.A.W., Bronsvoort, B.M. De. C., Knott, S.A., Woolhouse, M.E.J. and Kruuk, L.E.B. 2015. Variation and covariation in strongyle infection in East African shorthorn zebu calves. Parasitology 142(3):499-511.
    Permanent link to cite or share this item: https://hdl.handle.net/10568/67376
    DOI: https://dx.doi.org/10.1017/S0031182014001498
    Abstract/Description
    Parasite burden varies widely between individuals within a population, and can covary with multiple aspects of individual phenotype. Here we investigate the sources of variation in faecal strongyle eggs counts, and its association with body weight and a suite of haematological measures, in a cohort of indigenous zebu calves in Western Kenya, using relatedness matrices reconstructed from single nucleotide polymorphism (SNP) genotypes. Strongyle egg count was heritable (h2 = 23·9%, s.e. = 11·8%) and we also found heritability of white blood cell counts (WBC) (h2 = 27·6%, s.e. = 10·6%). All the traits investigated showed negative phenotypic covariances with strongyle egg count throughout the first year: high worm counts were associated with low values of WBC, red blood cell count, total serum protein and absolute eosinophil count. Furthermore, calf body weight at 1 week old was a significant predictor of strongyle EPG at 16–51 weeks, with smaller calves having a higher strongyle egg count later in life. Our results indicate a genetic basis to strongyle EPG in this population, and also reveal consistently strong negative associations between strongyle infection and other important aspects of the multivariate phenotype.
    CGIAR Affiliations
    Livestock and Fish
    AGROVOC Keywords
    ANIMAL DISEASES; ANIMAL BREEDING
    Subjects
    ANIMAL BREEDING; ANIMAL DISEASES; CATTLE; LIVESTOCK;
    Regions
    AFRICA; EAST AFRICA
    Collections
    • Livestock Fish Flagship: Animal Health [71]
    • ILRI articles in journals [5079]

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