Fine Variety Breeding Techniques of Tagetes erecta L. 萬壽菊良種繁育技術。
It was found, in one livestock elite station of Xuzhou, the ejaculum quality,eros and performance of some adult bulls were poor in recent years. 近幾年來，徐州市某家畜良種站飼養的部分成年公牛表現常年精液品質不良，性慾差，生產能力低下。
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