4Schwab E C, Schwab C G, Shaver R D, et al. Dietary forage and nonfihar carbohydrate contents influence B-vitamin intake, duodenal flow, and apparent mminal synthesis in lactating dairy cows[J]. Journal of Dairy Science, 2006, 89( 1 ) : 174 - 187.
5Niehoff I, Hflther L, Lebzien P, Niacin for dairy cattle: a review [J]. British Journal of Nutrition, 2009, 101(01) : 5 -19.
6Erickson P S, Murphy M R, Clark J H. Supplementation of dairy cow diets with calcium salts of long-chain fatty acids and nicotinic acid in early lactation[J]. Jounml of Dairy Science, 1992, 75(4) : 1078 - 1089.
7Homer J L, Coppcek C E, Schelling G T, et al. Influence d niacin and whole cottonseed on intake, milk yield and composition, andsystemic responses of dairy cows [ J ]. Journal of Dairy Science, 1986, 69(12) : 3087 -3093.
8Martinez N, DePeters E J, Bath D L. Supplemental niacin and fat effects on milk composition of lactating Holstein cows[ J ]. Journal of Dairy Science, 1991,74( 1 ): 202-210.
9Skaar T C, Grummer R R, Dentine M R, et el. Seasonal effects of prepartum and postpartum fat and niacin feeding on lactation perform- ance and lipid metabolism[J]. Journal of Dairy Science, 1989, 72 (8) : 2028 -2038.
10Drackley J K, LaCount D W, Elliott J P, et al. Supplemental fat and nicotinic acid for Holstein cows during an entire lactation[ J]. Jour- nal of Dairy Science, 1998,81(1) : 201 -214.
