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来源：雅诚德英语网
One was scientific feeding and management on the basis of different nutrient requirement for different developing stages of dairy cows.
一是根据奶牛各饲养阶段对营养需要的不同进行科学合理的饲料搭配与管理；
One was scientific feeding and management on the basis of different nutrient requirement for different developing stages of dairy cows.
一是根据奶牛各饲养阶段对营养需要的不同进行科学合理的饲料搭配与管理；