加强奶牛饲养管理的几点措施

奶牛是草食家畜,为其提供优质干草、高质量青贮料等,是高产奶牛健康发展的必要条件。奶牛育成期的重点是使其消化系统得到锻炼,为产奶期的大采食量做好准备。干奶期注意保胎,适当提升奶牛体况。围产期根据奶牛乳房变化,尽可能让其多采食,泌乳期抓好日粮搭配管理提高产奶量。抓好奶牛品种和个体的选育,提高奶牛的受胎率和产犊成活率,做好疾病的预防和治疗,以获得高产高收益。

Determination of Physiological Biochemical Parameters and Reproductive Performance in Transgenic sFat-1 Gene Pigs

[Objective] The aim was to evaluate the health of transgenic sFat-1 gene pigs in order to provide a reference for the breeding selection of pig excellent individuals. [Method] 15 physiological biochemical parameters and reproductive performances of 21 negative control pigs and 20 transgenic sFat-1 gene pigs were determined. [Result] The liver functions of some transgenic sFat-1 gene pigs were hurted lightly,and the reproductive performance also decreased lightly. [Conclusion] The determination of physiological biochemical parameters and reproductive performance in transgenic pigs could be taken as one of effective methods in environmental safety evaluation of transgenic pigs.

长毛兔的良种选育理论与实践

通过对长毛兔不同选育方法、兔毛产量的遗传力及产生杂交优势的必备条件的分析,结合多项育种研究实践,提出了兔毛产量难以产生杂交优势的观点,而个体选择法是提高兔毛产量最便捷、最有效的方法。