添喂色氨酸、过瘤胃色氨酸对奶牛泌乳性能、血浆指标和乳中褪黑素含量的影响
Effects of Tryptophan and Rumen-Protected Tryptophan Supplementations on Lactation Performance, Plasma Indexes and Milk Melatonin Content of Dairy Cows
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