4Hunagate R E. The Rumen and Its Microbes[M]. New York: Academic Press. 1966: 56-58.
5Moore B E, Dehority B A. Effects of diet and hindgut defau nation on diet digestibility and microbial concentrations in the cecum and colon of the horse [J]. Journal of Animal Science, 1993, 71(12): 3 350-3 358.
6Xiao J B, Chen L S, Yang F, et al. Green, yellow and red e- mitting Cd,Te, QDs decreased the affinities of apigenin and luteolin for human serum albumin in vitro[J]. Journal of Hazardous Material, 2010, 182(1-3): 696-703.
7Stanley C C, Williams C C, Jenny B F, et al. Effects of feed ing milk replacer once versus twice daily on glucose metabolism in holstein and jersey Calves[J]. Journal of Dairy Science, 2002, 85(9): 2 335-2 343.
8Kennedy P M, Milligan L P. Transfer of urea from the blood to the rumen of sheep[J]. British Journal of Nutrition, 1978,40(1) : 149-154.