本论文第二部分主要研究了四种不同精粗比典型日粮条件下泌乳奶牛瘤胃氮素代谢、小肠蛋白质的消化吸收及其对生产性能的影响。
The second part was mainly conducted to study the effects of four typical diets on rumen nitrogen metabolism, protein digestion and absorption in the small intestine, and dairy cow's milk performance.
本试验结论：产前饲粮中添加阴离子盐能够改善奶牛产后的健康状况，提高泌乳性能。
It was concluded that the performance and health status of postpartum dairy cows can be improved when prepartum diets are supplemented with anionic salts.
酮病、脂肪肝奶牛伴发低血糖，泌乳量下降，血液多种生化指标、肝脂含量发生不同程度的改变。
Cows suffering from ketone disease and fatty liver disease would go with hypoglycemia, declining milk yield and changes of blood chemical indexes and fat contents in liver at different degrees.
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