STANLEY 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.
HALL 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.
[16]
MCSHANE T M, SCHILLO K K, ESTIENNE M J, et al.Effects of recombinant DNA-derived somatotropin and dietary energy intake on development of beef heifers: Ⅱ. Concentrations of hormones and metabolites in blood sera[J].Journal of Animal Science, 1989, 67:2237-2244.
[17]
COMA 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.