高寒地区奶牛“性控精液”应用推广试验

试验对奶牛＂性控精液＂在高寒地区的推广应用进行了研究。结果表明：成年牛的受胎率（41.64%）极显著低于青年牛（65.31%）（P〈0.01）;性控精液与常规精液相比其受胎率,青年牛组分别为65.31%和67.80%,两者之间差异不显著（P﹥0.05）,而成母牛组分别为41.64%和54.03%,两者之间差异极显著（P﹤0.01）;饲养状态（集中饲养、散养）对性控精液的受胎率有显著影响（P〈0.05）,集中饲养明显优于散养;季节对性控精液的受胎率无显著影响（P〉0.05）。

The Application and Extension Experiment of Sexing Semen Technology in Dairy Cow in Alpine Region

The test is an research on the spread and apply of the sexing semen of milk cows in high and cold area.The experiment result shows that the pregnancy rate of mature cows（41.64%）is much lower than that of youth milk cows（65.31%）（P0.01）.The comparison of the pregnancy rate of routine semen and sexing semen among the youth milk cow group is not very notable,which are 65.31% and 67.80%,respectively（P0.05）.However,the consequence of that among the grown cow group are 41.64% and 54.03%,which is conspicuous different（P0.01）.The choice of raise methods,collective raise or free style raise,has distinctive effect on the pregnancy rate of sexing semen（P0.05）.The result shows that collective raise is much superior to free style breed.On the other hand,the season factor has little effect on the pregnancy rate of sexing semen（P0.05）.