半胱胺和过瘤胃蛋氨酸不同组合对奶牛产奶性能、瘤胃微生物蛋白产量和氮排泄的影响
Effects of Different Combinations of Cysteamine and Rumen-Protected Methionine on Lactation Performance, Rumen Microbial Protein Production and Nitrogen Excretion of Dairy Cows
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