Genetic improvement by crossing was a main practice for more than 20 years in beef cattle production in China.
杂交改良是20余年来我国肉牛生产的主要实践。杂交是育种的方法之一。但它同正规的育种工作是有界限的。
Twenty years ago, when the Soviet Union collapsed, so did beef production in Russia. Breeding and management programs for beef cattle fell apart.
苏联20年前解体时，俄罗斯的牛肉生产也随之瓦解，菜牛(又译肉用牛、食用牛)的饲养和管理项目分崩离析。
Twenty years ago, when the Soviet Union collapsed, so did beef production in Russia. Breeding and management programs for beef cattle fell apart.
苏联20年前解体时，俄罗斯的牛肉生产也随之瓦解，菜牛(又译肉用牛、食用牛)的饲养和管理项目分崩离析。
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