5Girard C L.B-complex vitamins for dairy cows:a new approach[J].Can J Anim Sci,1998,78 Supplement:71-90.
6Chiquette J,Girard C L,Matte J J.Effect of Diet and Folic Acid Addition on Digestibility and Ruminal Fermentation in Growing Steers[J].J Anim Sci,1993,71:2793-2798.
7Bentley O G,Latona A,De Paul P,et al.Factors affecting the digestibility of cellulose of poor quality hay[J].Journal of animal science,1953,10:1038-1043.
8Wasserman R H,Seeley H W and Loosli J K.The physiology and nutrition of a rumen lactobacillus[J].Journal of animal science,1953,12:935-939.
9Hayes B W,Mitchell G E,Little C O,et al.Concentrations of B-vitamins in ruminal fluid of steers fed differents levels and physical forms of hay and grain.Int J Vit Res,1966,37:348-349.
10Hall G,Cheng E W and Burroughs W.B-vitamins and other factors stimulatory to cellulose digestion by washed suspensions of rumen microorganisms[J].Journal of animal science,1953,12:918-923.