乳用母牛淘汰原因分析与养殖效益研究

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4、得董关于学位论文原创性和使用授权的声明，独立进本人所呈交的学位论文，是在导师指导下行科学研究所取得出重要贡献的个人或集体，的成果，。对在论文研究期间给予指导、帮助和做均在文中明确说明。。本声明的法律责任由本人承担本人完全了解山东农业大学有关保留和使用学位论文的规定，同意学校保留和按要求向国家有关部口或机构送交论文纸质本和电子版，允许论文被查阅和借阅。本人授权山东农业大学可从将本学位论文的全部或部分、内容编入有关数据库进行检索，可臥采用影印缩印或其它复制手段保存论文和疋编本学位论文，同时授权

5、中国科学技术信息研究所将本学位论文收录到》，并向社会公众提供信息服务。《中国学位论文全文数揖库保密论文在解密后应遵守此规定。论文作者签名：４＾１＾导师签名：対Ｉ‘．’日期；ｂｉｏｌ目录中文摘要····································································································IAbstract···············································

6、····················································II前言···········································································································11.1奶牛养殖现状·························································································11.1

7、.1国际奶牛养殖现状················································································11.1.2我国奶牛养殖现状················································································11.1.3山东省奶牛养殖现状···································································

8、··········21.2牛群结构·······························································································21.3牛群淘汰的原因··············