Body composition of growing meat and lactating dairy goats
A. T. Ngwa, L. J. Dawson, R. Puchala, G. D. Detweiler, R. C. Merkel, Z. Wang, K. Tesfai, T. Sahlu, C. L. Ferrell, and A. L. GoetschJournal of Animal Science 87(E-Supplement 2):480-481. 2009
Growing 3/4 Boer x 1/4 Spanish (B) and Spanish (S) wethers were used to determine influences of diet and breed and multiparous Alpine does were used to determine how stage of lactation and dietary forage level affect body composition. Growing goats were fed 50% concentrate pelleted diet (C) or one based on grass hay (H) free-choice. Six wethers of each breed were harvested at 0 wk and six of each diet-breed combination were harvested at 14 and 28 wk. Empty body concentration of protein was 18.3, 17.5, 18.3, and 19.7% (SE = 0.29) and of fat was 24.0, 23.4, 10.8, and 10.3% for B:C, S:C, B:H, and S:H, respectively (SE = 0.59). Energy in accreted tissue was 17.0, 18.7, 16.3, and 6.4 MJ/kg for C:wk 1-14, C:wk 15-28, H:wk 1-14, and H:wk 15-28, respectively (SE = 1.39). Initial measures with lactating goats were on six does a few days after kidding (0 mo). Eighteen does were fed a 40% forage diet (40F) and 18 received a diet with 60% forage (60F) for 2, 4, or 6 mo of lactation. Fat in the carcass (13.8, 13.1, 16.5, 11.2, 11.5, and 14.4%), noncarcass tissues (18.6, 24.2, 33.3, 14.3, 16.5, and 24.5%), and empty body (16.5, 18.7, 25.2, 12.9, 14.1, and 19.5% for 40F-2 mo, 40F-4 mo, 40F-6 mo, 60F-2 mo, 60F-4 mo, and 60F-6 mo, respectively) was affected by stage of lactation and diet (P < 0.06). Based on daily change in tissue mass (-141, 56, and 90 g/d; SE = 21.4) and energy (-2.31, 1.11, and 2.90 MJ/d for 1-2, 3-4, and 5-6 mo, respectively; SE = 0.66), energy concentration in tissue mobilized or accreted was 16, 20, and 32 MJ/kg at 1-2, 3-4, and 5-6 mo, respectively. In conclusion, other than with a prolonged limited nutritional plane, an average energy concentration in accreted tissue of growing meat goats is 17.3 MJ/kg. The concentration of energy in tissue mobilized or accreted by dairy goats may vary with stage of lactation.
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