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乳牛改良注册牛
anim.husb. Dairy Her Improvement Registry
乳牛改良注册牛1965年起，美国各乳牛品种协会将原有的'牛群改良登记制'改为 '乳牛改良登记制'，由美国农业部乳牛改良研究所与各品种协会共同执行
anim.husb. Dairy Herd Improvement Registry

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