牛奶尿素氮含量与奶牛胎次、泌乳天数、产奶量和乳成分的关系
우내뇨소담함량여내우태차、비유천수、산내량화유성분적관계
The Relationship between Milk Urea Nitrogen and Parities, Days in Milk, Milk Production and Composition
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