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北京地区荷斯坦牛首次配种妊娠率(CR)影响因素分析
【机 构】
:
中国农业大学动物科技学院,北京100193 Department of Molecular Bio
【出 处】
:
第十七次全国动物遗传育种学术讨论会
【发表日期】
:
2013年12期
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