2Ainslie SJ,Fox D G,Perry T C,etal.Predicting amino acid adequacy of diets fed to Holstein steers.Animal science,1993(71):1312-1319.
3Houseknecht,Baumn K L D E,Fox D G,et al.Abomasal infusion of casein enhances nitrogen retention in somatotropin-treated steers.Nutr.,1992(122):1717-1725.
4Tylutki T P,Fox D G,Antique PG.Predicting net energy and protein requirements for growth of implanted and nonimplanted heifers and steers and nonimplanted bulls varying in body size.Animal science,1994(72):1806-1813.
