不同精粗比下添加维生素B12对体外瘤胃发酵和微生物酶活力的影响
불동정조비하첨가유생소B12대체외류위발효화미생물매활력적영향
In Vitro Rumen Fermentation and Microbial Enzyme Activities Influenced by Vitamin B12 Supplementation in Different Concentrate to Forage Ratios
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