1 王赞江,王丽.尿素氮监测在奶牛生产中的应用[J].奶牛养殖,2006,8:39~41.2 孙海洲,沈美英,卢德勋,等.乳中尿素氮在奶牛营养监测中的应用[J].畜牧与饲料科学,2005,6(2):47.3 陆静.牛奶中尿素氮(MUN)的测定[J].乳业科学与技术,2001,24:4.4 赵静雯,赵圣国,孙鹏,等. 奶牛乳蛋白源前体物生成与利用的相关影响因素[J].中国畜牧兽医,2012,39(1):78~81.5 翟少伟,吴跃明,姚建红.蛋白质摄入量对牛奶尿素氮影响的评价[J].当代畜牧,2004,3:23~25.6 Campeneere S D, Brabander D L D,Vanacker J M. Milk urea concentration as affected by the roughage type offered to dairy cattle[J].Livestock Science, 2006,103:30~39.7 Cole N A, Green L W, McCollum F T,et al. Influence of oscillating dietary crude protein concentration on performance, acidbase balance,and nitrogen excretion of steers[J].Journal of Animal Science,2003,81:2660~2668.8 Collins R M, Pritchard R H. Alternate day supplementation of corn stalk diets with soybean meal or corn gluten meal fed to ruminants[J].Journal of Animal Science,1992,70:3899~3908.9 Gabler M T, Heinrichs A J. Altering soluble and potentially rumen degradable protein for prepubertal Holstein Heifers[J]. J Dairy Sci,2003,86:2122~2130.10Hojman D, Gips M, Ezra E. Association between live body weight and milk urea concentration in Holstein cows[J].J Dairy Sci,2005,88:580~584.11Johnson R G,Young A J. The association between milk urea nitrogen and DHI production variables in western commercial dairy herds[J].J Dairy Sci,2003,86(9):3008~3015.12Jonker J S,Kohn R A,Erdman R A. Using milk urea nitrogen to predict nitrogen excretion and utilization efficiency in lactating dairy cows[J].J Dairy Sci,1998,81:2681~2692.13Kauffman A J,St-Pierre N R. The relationship of milk urea nitrogen to urine nitrogen excretion in Holstein and Jersey cows[J].J Dairy Sci,2001,84:2284~2294.14Kohn R A,Kalscheur K F,Russek-Cohen E. Evaluation of models to estimate urinary nitrogen and expected milk urea nitrogen[J].J Dairy Sci,2002,85:227~233.15Kohn R A,Dou Z, Ferguson J D. A sensitivity analysis of nitrogen losses from dairy farms[J].Journal of Environmental Management,1997,50:417~428.16Konig S, Chang Y M, et al. Genetic and phenotypic relationships among milk urea nitrogen,fertility,and milk yield in Holstein cows[J].J Dairy Sci, 2008,91:4372~4382.17Leonardi C, Stevenson M, Armentano L E. Effect of two levels of crude protein and methionine supplementation on performance of dairy cows[J].J Dairy Sci,2003,86:4033~4042.18Melendez P, Donovana A, Hernandez J .Milk urea nitrogen and infertility in Florida Holstein cows[J].J Dairy Sci,2000,83(3):459~463.19Peterson A B, French K R, Russek-Cohen E, et al. Comparison of analytical methods and the influence of milk components on milk urea nitrogen recovery[J].J Dairy Sci,2004,87:1747~1750.20Rajala-Schultz P J, Saville W J A. Association between milk urea nitrogen and fertility in Ohio dairy cows[J].J Dairy Sci,2001,84(2):482~489.21Schwab C G. Rumen-protected amino acids for dairy cattle: Progress towards determining lysine and methionine requirements[J].Animal Feed Science Technology, 1996,59:87~101.23Zhai S W, Liu J X, Wu Y M, et al. Predicting urinary nitrogen excretion by milk urea nitrogen in lactating Chinese Holstein cows[J].Animal Science Journal,2007,78:395~399. |