Protein requirements of Shaanbei female white cashmere goat in nonpregnant period | 空怀期陕北白绒山羊母羊蛋白质需要量研究

chinois. 研究空怀期陕北白绒山羊的蛋白质需要量，为建立和完善陕北白绒山羊饲养标准提供基础数据。将体质量相近、健康状况良好的24只第2胎次空怀期陕北白绒山羊母羊随机分成4组，各组试验羊分别饲喂消化能水平均为NRC（1981）肉用和奶用山羊推荐维持需要量的1.2倍、粗蛋白质水平分别为NRC（1981）肉用和奶用山羊推荐维持需要量的80%，90%，100%和110%饲粮，进行为期66 d的饲养试验（其中预试期7 d）；同时在试验中期（第25天），每组选择3只羊按照全收粪、尿法进行为期7 d 的消化代谢试验。空怀期陕北白绒山羊母羊对4种日粮粗蛋白质的表观消化率差异不显著（P＞0.05），平均为（65.54±0.43）%；供试羊平均日增质量随日粮粗蛋白质和可消化粗蛋白质摄入量的增加呈近似于直线的变化（P＜0.05），其相关系数分别为0.989 6和0.982 5。建立了空怀期陕北白绒山羊母羊粗蛋白质（CP）和可消化粗蛋白质营养需要量（DCP）与代谢体质量（W0.75）和平均日增质量（ADG）间的回归方程，确定了空怀期陕北白绒山羊母羊饲粮中粗蛋白质和可消化粗蛋白质水平(以风干样为基础)分别以8.29%～10.43% 和5.43%～6.83%较为适宜。

anglais. The aim of this research was to study protein requirements of nonpregnant Shaanbei white cashmere goat so as to provide parameters for establishing and perfecting the feeding standards for Shaanbei white cashmere goat. 24 nonpregnant healthy ewes in the second birth order with similar weights were chosen and randomly divided into four groups. During the feeding trial period of 66 days, the first 7 days of which were preparative feeding period, every group was fed with the dietary with the same DE level of 7.90 MJ/d and different CP levels of 48.51，55.92，63.53 and 68.14 g/d respectively. Three ewes were selected in each group to conduct the digestion and metabolism trial (collecting all the feces) for 7 days starting from the 25th day. The apparent crude protein digestion rates of nonpregnant ewes with different dietaries were not significantly different（P＞0.05）, with an average of (65.54±0.43)%. The average daily gain of ewes increased in a linear relation with the growing daily intake of crude protein (CP)and digestible protein (DCP) (P＜0.05). The correlation coefficients for CP and DCP were 0.989 6 and 0.982 5, respectively. The regression equation was established which described the relation of nutrition requirement in crude protein (CP) and digestible protein (DCP), metabolic weight(W0.75) and daily weight gain (ADG) of nonpregnant Shaanbei white cashmere goat. The appropriate amounts of CP and DCP in daily ration (based on airing sample) were 8.29%-10.43% and 5.43%-6.83%, respectively for the Shaanbei white cashmere goat in nonpregnant period.