Hurwitz S, Sklan D, Bartov I
Poult Sci. 1978 Jan;57(1):197-205. doi: 10.3382/ps.0570197.
Body weight and the intake of metabolizable energy of chicks as function of age, were resolved into a linear equation from which the energy requirements for maintenance and growth were extracted. The metabolizable energy requirement for maintenance was calculated to be 1.91 and 1.62 Cal./g. 2/3, and that for weight gain was 2.05 and 2.19 Cal./g. for male White Rock and female 2--8-week old Leghorn chicks, respectively. The amino acid requirements of growing broiler chicks were calculated from the maintenance requirements, body weight gain and body weight, the proportions of feather protein in total body protein, and the amino acid composition of carcass and feathers. The requirements thus calculated, correlated well with various values in the literature. Diets formulated on the basis of the present model, were lower in protein and amino acid contents than those formulated on the basis of NRC allowances. These differences were pronounced in diets designed for 6--8 week old chicks. The weight gains obtained were similar for both types of diets. Feed conversion were slightly poorer and abdominal fat higher in chicks fed the model diets. It is concluded that the present model can serve, at least as an initial approach, to calculate the protein and amino acid requirements.
将雏鸡体重及可代谢能量摄入量作为年龄的函数，解析为一个线性方程，从中提取维持和生长所需的能量。经计算，雄性白洛克雏鸡和2至8周龄雌性来航雏鸡维持所需的可代谢能量分别为1.91和1.62卡/克2/3，增重所需的可代谢能量分别为2.05和2.19卡/克。根据维持需求、体重增加量、体重、羽毛蛋白在总蛋白中的比例以及胴体和羽毛的氨基酸组成，计算生长肉鸡雏鸡的氨基酸需求。如此计算出的需求与文献中的各种值相关性良好。基于本模型配制的日粮，其蛋白质和氨基酸含量低于基于美国国家研究委员会（NRC）标准配制的日粮。这些差异在为6至8周龄雏鸡设计的日粮中尤为明显。两种日粮的增重相似。饲喂模型日粮的雏鸡饲料转化率略低，腹部脂肪含量更高。得出的结论是，本模型至少可作为计算蛋白质和氨基酸需求的一种初步方法。
