1Fernandez,S.C,Budowski,P. Pre-intestinal stability of beta-carotene in ruminants[J].lnt J Vitam Nutr Res,1976.439-445.
2Weiss,W.P,Smith.K.L. Effect of Forage to Concentrate Ratio On Disappearance of Vitamin A and E During In Vitro Ruminal Fermentation[J].Journal of Dairy Science,.
7ERDMAN R A,SHARMA,B K.Effect of dietary rumen protected choline in lactating dairy cows[J].J Dairy Sci,1991,74:1641-1647.
8PINOTTI L,BALDI A,CHELI F,et al.Dairy cows peripartum feeding strategy:rumen protected choline supplementation.In Proceedings of the Symposium on Immunology of the Ruminant Mammary Gland[M].Parma:Tipolitografia Benedettina Scrl,2000.
9BONOMI A,QUARANTELLI A,BONOMI B M,et al.L′integrazione delle razioni per le bovine da latte con colina in forma rumino-protetta.Effetti sull'efficienza produttiva e riproduttiva(Inclusion of rumenprotected choline in diets for dairy cattle.Effect on productive and reproductive efficiency[J].Rivista di Scienza dell′ Alimentazione,1996,25:413-434.
10FILIPPO R,MOSCHINI M,MASOERO F,et al.Rumen degradation and intestinal digestibility of rumen protected amino acids:comparison between in situ and in vitro data[J].Animal Feed Science and Technology,2003,108:223-229.
