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牛群改良登记制
anim.husb. Herd Improvement Registry
牛群改良登记制美国于1925年起由各乳牛品种协会建立的改进纯种牛群质量的登记制度。与乳牛改良协会的工作有许多共同之处
anim.husb. Herd Improvement Registry

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