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The Relationship between Milk Urea Nitrogen and Parities, Days in Milk, Milk Production and Composition
Author(s): 
Pages: 10-14
Year: Issue:  12
Journal: China Dairy Cattle

Abstract: 本试验共收集10316条DHI记录并分析了奶牛胎次和泌乳天数对牛奶尿素氮(MUN)含量的影响以及MUN值与产奶量和乳成分的关系.结果表明,各胎次间MUN值有差异.泌乳天数在90~120d时,MUN值最高;在90~120d以前,MUN值随泌乳天数的增加而升高;在90~120d以后,MUN值大体上随泌乳天数的增加而降低.MUN值和4%标准乳产量(FCM)之间呈二次曲线相关(Y=-0.002X2+0.1...
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