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。
The experiment used 10316 Dairy Herd Improvement(DHI)records to analyze the impact of parities and days in milk(DIM)on Milk Urea Nitrogen(MUN), and the relationship between MUN and milk composition.
每天梅丽乳业可以从奶农手中采购到小于或者等于奶农最大产量的整数数量的牛奶。
Each day, Merry Milk Makers can purchase an integral amount of milk from each farmer, less than or equal to the farmer's limit.
每天梅丽乳业可以从奶农手中采购到小于或者等于奶农最大产量的整数数量的牛奶。
Each day, Merry Milk Makers can purchase an integral amount of milk from each farmer, less than or equal to the farmer's limit.
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