4Butler W R. Review: Effect of protein nutrition on ovarian and uterine physiology in dairy cattle. J. Dairy Sci., 1998(81 ) : 2533 - 2539. 被引量：1
5Canfield R W, Sniffen C J, Butler W R. Effects of excess degradable protein on postpartum reproduction and energy balance in dairy cattle. J. Dairy Sci., 1990(73) : 2342 - 2349. 被引量：1
6Elrod C C, Butler W R. Reduction of fertility and alteration of uterine pH in heifers fed excess ruminally degradable protein. J. Anim. Sci. , 1993 ( 71 ) : 694 - 701. 被引量：1
7Liu C, Schingoethe D J, Stegeman G A. Corn Distillers Grains versus a Blend of Protein Supplements with or without Ruminally Protected Amino Acids for Lactating Cows. J. Dairy Sci. ,2000(83) :2075 - 2084. 被引量：1
8McCormick M E, French D D, Brown T F, et al. Crude protein and rumen undegradable protein effects on reproduction and lactation performance of Holstein cows. J. Dairy Sci., 1999(82) :2697 - 2708. 被引量：1
9Wang C,Liu J X,Yuan Z P, et al. Effect of level of metabolizable protein on milk production and nitrogen utilization in lactating dairy cows. J. Dairy Sci., 2007(90) :2960 - 2965. 被引量：1
10Zhai S W, Liu J X, Ma Y. Relation between milk urea content and nitrogen excretion from lactating cows. Acta Agricuhurae Scand Section A., 2005 (55):113 - 115. 被引量：1
4Michal Daley,Phillip Hayes. Mastitis: Why is it sohard to cure[J]. Cornell Vet, 1992, 82(1): 1-9. 被引量：1
5Freeman A E. Secondary traits: Sire evaluation and the reproductive complex [J]. J Dairy Sci, 1984, 67:449-459. 被引量：1
6Datati E B W,Kennedy, Burnside E B. Relationship between conformation and cawing interval in Holstein cows[J]. J Dairy Sci,1986,69:3112-3119. 被引量：1
7Arunvips P.,I.R. Dohoo, J.A. Vanleeuwen, and G.P. Keefe.2003. The effect of non-nutritional factors on milk urea nitrogen levels in dairy cows in Prince Edward Island Canada Preterinary Veterinary Medicine. 59:83-93. 被引量：1
8BakerKinetic analysisin dairy cows. JD. Ferguson, and C. F. Ramberg. 1992.of urea transport from plasma to milk Dairy Sei. 75(Suppl. 1):181(Abstr.). 被引量：1
9Broderick Glen A. And Murray K.Clayton.1997.A Statistical Evaluation of Animal and nutritional Factors Influencing Concentrations of milk urea Nitrogen.J Dairy Sci 80:2964-2971. 被引量：1
10Cannas, A. A. Pes, Mancuso, B. Vodret, And A. Nudda.1998. Effect of Dietary Energy and Protein Concentration on the Concentration of Milk Urea Nitrogen in Dairy Ewes. J. Dairy Sci. 81:499-508. 被引量：1
6Welch J G, Hooper A P. Ingestion of feed and water[M].Church D C. The ruminant animal digestive physiology and nutrition. Prospect Heights, Illinois: Waveland Press, Inc, 1993:108--116. 被引量：1
7National Research Council. Nutrient P.equirements of Dairy Cattle. 7th rev. ed Washington, D.C. National Academy Press. 2001. 被引量：1
8Buttery P J, Foulds A N. Amino acid requirenlents of ruminants[M]. Haresign W, Cole DJ A. Recent advances in animal nutrition. London: Butterworth Heinemann, 1985:257- 271. 被引量：1
9Broderick G A, Stevenson M J, Patton R. A, et al. Effect of supplement in tureen-protected methionine on production and Nitrogen excretion in lactating dairy cows[J]. Journal of Dairy Science, 2008, 91:1092- 1102. 被引量：1
10Noftsger S M, St-Pierre N R, Firkins J L, et al. Effects of 2-hydroxy-4-(methylthio) butanoic acid (HMB) on microbial growth in continuous cultttre[J]. Jourmd of Dairy Science, 2003, 86:2629 -2636. 被引量：1
