Blanchart G, Brun-Bellut J, Vignon B
Reprod Nutr Dev (1980). 1980;20(5B):1731-7.
The voluntary food intake, organic matter, crude protein and crude fiber digestibility and nitrogen balance of 23 diets have been measured simultaneously using 5 to 7 wethers and 5 to 7 castrated billy-goats in digestibility trials. The goats ate more than the wethers (58 vs 46 g DM/kg W0.75). The digestibilities obtained for goats were highly correlated with those obtained for wethers, and the mean values were similar in both species: Organic matter: digestion coefficient (CUD)goats = 1.22 CUDwethers -14.5 r = 0.93 Crude protein: digestion coefficient (CUD)goats = 1.07 CUDwethers -4.8 r = 0.94 Crude fiber: digestion coefficient (CUD)goats = 0.56 CUDwethers +29.6 r = 0.78 The mean nitrogen balance for goats (226 mg/kg W0.75) was significantly higher than that of wethers (152 mg/kg W0.75). Based on the regression equations for each species, the calculated efficiency of proteins digestible in the intestine (PDI) was 55 p. 100, the endogenous urinary nitrogen 160 mg/kg W0.75 and the nitrogen maintenance requirement 1.8-1.9 g of PDI/kg W0.75.
在消化试验中，使用5至7只阉羊和5至7只去势公山羊，同时测定了23种日粮的自愿采食量、有机物、粗蛋白和粗纤维消化率以及氮平衡。山羊的采食量高于阉羊（58克干物质/千克体重0.75对46克干物质/千克体重0.75）。山羊的消化率与阉羊的消化率高度相关，两个物种的平均值相似：有机物：消化系数（CUD）山羊 = 1.22×CUD阉羊 - 14.5，r = 0.93；粗蛋白：消化系数（CUD）山羊 = 1.07×CUD阉羊 - 4.8，r = 0.94；粗纤维：消化系数（CUD）山羊 = 0.56×CUD阉羊 + 29.6，r = 0.78。山羊的平均氮平衡（226毫克/千克体重0.75）显著高于阉羊（152毫克/千克体重0.75）。根据每个物种的回归方程，计算出的肠道可消化蛋白质（PDI）效率为55%，内源尿氮为160毫克/千克体重0.75，氮维持需要量为1.8 - 1.9克PDI/千克体重0.75。
