[1] REZAEI J,ROUZBEHAN Y,ZAHEDIFAR M,et al.Effects of dietary substitution of maize silage by amaranth silage on feed intake,digestibility,microbial nitrogen,blood parameters,milk production and nitrogen retention in lactating Holstein cows[J].Animal Feed Science and Technology,2015,202:32-41.
[2] 刘洋,晁洪雨,王自然.杞柳条生皮替代苜蓿对奶牛泌乳性能的影响[J].畜牧与兽医,2015,47(2):153-155.
[3] 张丽英.饲料分析及饲料质量检测技术[M].3版.北京:中国农业大学出版社,2007:56-56,67-78.
[4] BRODERICK G A,KANG J H.Automated simultaneous determination of ammonia and total amino acids in ruminal fluid and
in vitro media[J].Journal of Dairy Science,1980,63(1):64-75.

[5] ERWIN E S,MARCO G J,EMERY E M.Volatile fatty acid analyses of blood and rumen fluid by gas chromatography[J].Journal of Dairy Science,1961,44(9):1768-1771.

[6] ZHONG R Z,LI J G,GAO Y X,et al.Effects of substitution of different levels of steam-flaked corn for finely ground corn on lactation and digestion in early lactation dairy cows[J].Journal of Dairy Science,2008,91(10):3931-3937.

[7] 冯仰廉.反刍动物营养学[M].北京:科学出版社,2004:138-141,218-229,337-340.
[8] MERTENS D R.Creating a system for meeting the fiber requirements of dairy cows[J].Journal of Dairy Science,1997,80(7):1463-1481.

[9] 邬彩霞,陈国宏,赵国琦.TMR中苜蓿干草长度对奶牛瘤胃发酵的影响[J].中国畜牧杂志,2011,47(5):58-61.
[10] BEAUCHEMIN K A,YANG W Z,RODE L M.Effects of barley grain processing on the site and extent of digestion of beef feedlot finishing diets[J].Journal of Animal Science,2001,79(7):1925-1936.

[11] BEAUCHEMIN K A,YANG W Z,RODE L M.Effects of particle size of alfalfa-based dairy cow diets on chewing activity,ruminal fermentation,and milk production[J].Journal of Dairy Science,2003,86(2):630-643.

[12] 李洋.湿玉米纤维饲料对奶牛瘤胃代谢特性和血液生化指标的影响[D].硕士学位论文.哈尔滨:东北农业大学,2014.
[13] 杨宏波,刘红,占今舜,等.不同精粗比颗粒饲料对断奶公犊牛瘤胃发酵参数和微生物的影响[J].草业学报,2015,24(12):131-138.
[14] BRUNETTE T,BAURHOO B,MUSTAFA A F.Replacing corn silage with different forage millet silage cultivars:effects on milk yield,nutrient digestion,and ruminal fermentation of lactating dairy cows[J].Journal of Dairy Science,2014,97(10):6440-6449.

[15] 周汉林,莫放,李琼,等.日粮中性洗涤纤维水平对生长公牛碳水化合物和蛋白质消化代谢的影响[J].家畜生态学报,2006,27(3):59-64.
[16] 夏科,王志博,郗伟斌,等.粗饲料组合对奶牛饲粮养分消化率、能量和氮的利用的影响[J].动物营养学报,2012,24(4):681-688.
[17] 李亚奎,褚海义,刘贵河,等.饲粮中添加不同比例苜蓿干草对泌乳中期奶牛生产性能的影响[J].饲料研究,2015(17):36-39.
[18] 李喜艳,王加启,魏宏阳,等.反刍动物乳腺氨基酸的吸收与代谢[J].中国奶牛,2011(2):11-14.
[19] STAPLES C R.Milk fat depression in dairy cows-influence of supplemental fats[C]//Florida ruminant nutrional symposium,[S.l.]:[s.n.]2006.
[20] 刘国文,李心慰,李小兵,等.奶牛生产疾病的早期诊断及群体监测[J].中国兽医学报,2014,34(9):1544-1550.
[21] 史仁煌,董双钊,付瑶,等.饲粮中性洗涤纤维水平对泌乳高峰期奶牛生产性能、营养物质表观消化率及血清指标的影响[J].动物营养学报,2015,27(8):2414-2422
[22] REYNOLDS C K.Production and metabolic effects of site of starch digestion in dairy cattle[J].Animal Feed Science and Technology,2006,130(1/2):78-94.
[23] 文静,卜登攀,孙鹏,等.不同日粮模式对奶牛血液及瘤胃液中主要代谢激素的影响[J].黑龙江畜牧兽医,2013(9):10-14.
[24] 韩英东,杨亮,潘晓花,等.胎次和泌乳阶段对荷斯坦奶牛血液乳成分前体物及泌乳相关激素含量的影响[J].动物营养学报,2015,27(4):1135-1144.
[25] LEPAGE O,TOTTMAR O,WINBERG S.Elevated dietary intake of
L-tryptophan counteracts the stress-induced elevation of plasma cortisol in rainbow trout(
Oncorhynchus mykiss)[J].The Journal of Experimental Biology,2002,205(23):3679-3687.
[26] 范铤.日粮中NDF水平及粗饲料NDF降解率对奶牛采食量及生产性能的影响的研究[D].硕士学位论文.泰安:山东农业大学,2014.
[27] 马健,刘艳芳,王雅晶,等.饲粮中添加禾王草对泌乳奶牛瘤胃发酵和生产性能的影响[J].动物营养学报,2015,27(11):3429-3437.
[28] 李玲,赵秀芬,赵钢.青贮处理对饲料蛋白质组分的影响[J].中国草地学报,2010,32(6):110-112.
[29] WRIGHT T C,MOSCARDINI S,LUIMES P H,et al.Effects of rumen-undegradable protein and feed intake on nitrogen balance and milk protein production in dairy cows[J].Journal of Dairy Science,1998,81(3):784-793.

[30] 姚庆,辛杭书,王明君,等.酒精清液发酵玉米秸秆替代全株玉米青贮对奶牛生产性能的影响[J].动物营养学报,2012,24(11):2230-2236.
[31] MIGLIOR F,SEWALEM A,JAMROZIK J,et al.Analysis of milk urea nitrogen and lactose and their effect on longevity in canadian dairy cattle[J].Journal of Dairy Science,2006,89(12):4886-4894.