如何理解美国官方荷斯坦牛系谱
JOURNAL OF DAIRY SCIENCE AND TECHNOLOGY(2002)
Abstract
近年来我国许多地方政府、企业、公牛站、奶牛场纷纷从国外引进冻精、胚胎和活牛,以改良牛群的遗传素质,起到了积极的作用(表1),而这些进口国主要以美国、加拿大和澳大利亚等为主.
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