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乳牛改良协会
anim.husb.
Dairy Improvement Association
;
Dairy Herd Improvement Association
乳牛改良协会
为美国农业部1905年建立的测定乳牛产奶性能的组织。分全国、各州及地方各级乳牛改良协会,进行乳牛产奶性能测定,纯种和级进奶牛都可参加
anim.husb.
Dairy Herd Improvement Association
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