Analyzing the pregnancy rate of Holstein cow improved from Norwegian red bull
YANG Yang, YE Cuifang, WANG Yushu, LI Guang, CHEN Aijiang, WANG Gang, JING Lei, OU Sihai
Animals Breeding and Feed . 2024, (05): 12 -16 .  DOI: 10.13300/j.cnki.cn42-1648/s.2024.05.012

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