
不同定时输精方案对青年母牛繁殖性能的影响
闫向民1,李红波1,张宝刚2,张金山1,王传军2,李娜3,袁理星1,张杨1
不同定时输精方案对青年母牛繁殖性能的影响
Effect of different timed insemination schemes on reproductive performance of heifers
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