5MAHMOUDZADEH H,FAZAE H, KORDNEJAD I, et al. Response of male buffalo calves to difference levels of energy and protein in finishing diets[J]. Pa- kistan Journal of biological Science, 2007, 10 ( 9 ) : 1398-1405.
7STANLEY C C,WILLIAMS C C, JENNY B F, et al. Effects of feeding milk replace once versus twice daily on glucose metabolism in Holstein and Jersey calves [ J ]. Journal of dairy science, 2002, 8 (9) : 2335 - 2344.
8HALL J B, STAIGMILLER R B,BELLOWS R A, et al.Body composition and metabolic profiles associated with puberty in beef heifers [ J ]. Journal of Animal Science, 1995,73 : 3409 -3420.
9MCSHANE T M, SCHILLO K K, ESTIENNE M J, et al. Effects of recombinant DNA-derived somatotropin and dietary energy intake on development of beef heif-ers: II. Concentrations of hormones and metabolites in blood sera [ J ]. Journal of Animal Science, 1989, 67: 2237-2244.
10COMA J, CARRION D, ZIMMERMAN D R. Use of plasma urea nitrogen as a rapid response criterion to determine the lysine requirement of pigs [ J ]. Journal of Animal Science, 1995,73 : 472-481.