Effect of wheat bran supplementation at graded levels on changes in physical body composition in teff straw (Eragrostis tef) fed Zebu (Bos indicus) oxen of the Ethiopian highlands
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The effect on body composition and carcass components of highland Zebu Bas indicus) oxen fed tef 'j' straw as basal diet and varying level of wheat bran as supplement was investigated. Fifty four castrated Zebu oxen, of 5-6 years age and similar body condition were allocated to three treatment groups based on a randomized block design with unequal block sizes and within block replication and were subjected to three levels of supplementation wheat bran (0.75, 2.75 and 4.75 wheat bran kg/day). Out of the 54 oxen, 18 of them (six from each treatment group) were slaughtered and both internal and external parts of the oxen were examined. Slaughter weight (SW) and Empty body weight (EBW) and hot carcass weight (HCW) were significantly affected (P<0.001) due to varying level of supplementation. There were no significant difference (p>0.05) between dressing percentage of EBW and SW. Adipose tissue fat (p<0.01), channel fat (0.001), omental and kidney know (p<0.01) increased as supplementation increased up to medium level and slightly decreased at high level of supplementation. Lean: fat ratio was significantly different (P<0.01). Liver (p<0.001) and spleen )p<0.05) from the internal organ and reticulo-rumen (p<0.01) from the digestive tract were also affected due to the change in the level of supplementation while hump fat increased as supplementation increased but was not significantly different (p>0.05).
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