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Effects of genotype and diet on growth and mass of organs and tissues of growing meat goats

A. T. Ngwa, L. J. Dawson, R. Puchala, G. Detweiler, R. C. Merkel G. Animut, T. Sahlu, C. L. Ferrell, and A. L.Goetsch

Journal of Animal Science 85(Supplement 2):36. 2007

Young 3/4 Boer x 1/4 Spanish (BS) and Spanish (S) wethers were used to determine influences of diet and genotype on growth and mass of organs and tissues. A 50% concentrate pelleted diet (C) and one based on grass hay (H) were fed free-choice. Six wethers of each genotype were harvested at 0 wk as well as six of each diet and genotype at 14 and 28 wk. Initial BW was 21.6 and 18.8 kg for BS and S, respectively (SE = 0.67). The only genotype difference in initial organ or tissue mass relative to empty BW (EBW) was a tendency (P < 0.09) for skin (10.38 vs 9.79% EBW for BS and S, respectively). Average daily gain during the entire experiment was influenced by an interaction (P < 0.05) between genotype and diet (199, 142, 44, and 50 g for BS-C, S-C, BS-H, and S-H, respectively). Likewise, average (mean of wk 14 and 28) EBW was greater (P < 0.05) for BS vs S with C and similar between genotypes with H (45.6, 34.8, 19.1, and 17.1 kg for BS-C, S-C, BS-H, and S-H, respectively). Carcass mass was greater (P < 0.05) for C vs H (56.2, 56.2, 53.2, and 54.0% EBW for BS-C, S-C, BS-H, and S-H, respectively). Mass of the liver (2.11, 1.92, 2.00, and 1.98% EBW; SE = 0.048) and gastrointestinal tract (5.50, 4.83, 8.43, and 8.36% EBW for BS-C, S-C, BS-H, and S-H, respectively; SE = 0.158) tended (P < 0.07) to be influenced by an interaction between genotype and diet. Mass of internal fat (12.16, 12.09, 3.36, and 3.37% EBW; SE = 0.364) and skin (9.55, 9.77, 11.97, and 11.27% EBW for BS-C, S-C, BS-H, and S-H, respectively; SE = 0.281) differed (P < 0.05) between diets but were not affected by genotype. In conclusion, growth advantages of growing Boer crossbred goats compared with Spanish realized with diets of high nutritive value may not be accompanied by differences in mass of organs or tissues other than relatively small ones for the liver and gastrointestinal tract in accordance with growth rate.


 

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