海南黑山羊生长期的能量与蛋白质需要量

试验选用12只海南黑山羊断奶羔羊（约4月龄）,采用饲养试验和消化代谢试验,研究生长期海南黑山羊的能量和蛋白质需要量及其代谢规律。试验羊分成4组,采用4×4拉丁方设计。按照Keral（1982）适宜于发展中国家的山羊饲养标准为参考设计了高能高氮、低能高氮、高能低氮、低能低氮4种能氮比的日粮。结果表明：舍饲海南黑山羊生长期干物质采食量与代谢体重和日增重的关系为DMI（g/d）=27.18W^0.75＋0.83△W＋210.76（r=0.8916）;总能、消化能、粗蛋白质和可消化蛋白质需要量的估测模型分别为GEI（MJ/d）=0.82W0.75＋0.028△W＋3.76（r=0.7804）,DEI（MJ/d）=0.59W^0.75＋0.021△W-0.24（r=0.6651）,CPI（g/d）=2.45W^0.75＋0.26△W＋22.14（r=0.5712）,DCP（g/d）=2.69W^0.75＋0.03△W-0.38（r=0.6605）;生长期海南黑山羊日粮总能代谢率平均为58.88%,粗蛋白的消化率平均为57.08%,净蛋白利用率平均为35.25%,每增重1g体沉积蛋白质需要量为0.37g。

Energy and Protein Requirements of Growing Hainan Black Goats

Twelve growing waning Hainan Black goats at the age of 4 months were selected for experiments and fed by using the feeding and digestion methods to observe their requirements for energy and protein,and their metabolism. The goats were divided into 4 groups and a 4×4 Latin design was arranged. Diets with 4 ratios of energy to nitrogen,i.e. high energy high N,low energy high N,high energy low N,low energy low N,were prepared according to Keral I.C. (1982) who recommended the nutrient requirements of goats in developing countries. The prediction equations of nutritional requirements for dry matter(DM),Gross energy(GE),digestible energy(DE),crude protein(CP) and digestible crude protein (DCP) by stall-feeding growing Hainan Black goats were: ZM//(g/d)=27.181W~(0.75)+0.83AJF+210.76(r=0.891 6),GEI(MJ/d)=0.82W~(0.75)+0.028△W+3.76(r=0.780 4),DEI(MJ/d)=0.59W~(0.75)+0.021 △W-0.24(r=0.665 1),CPI(g/d) =2.45W~(0.75)+0.26△W+22.14(r=0.5712),DCP(g/d)=2.69W~(0.75)+0.03 △W-0.38(r=0.660 5). For the stall-feeding growing Hainan Black goats,metabolic rate of gross energy of the diets was 58.88%,digestibility of crude protein 57.08%,and the total availability of protein 35.25%. The protein requirement of per unit live weight gain of meat goats is 0.37 g PD/g gain(PD,protein deposited).