季节变化对不同品种种公牛精液品质的影响研究

 选择3~4.5岁的四个品种种公牛25头，观察季节变化对其次均采精量、平均密度、平均活力、精子畸形率、精液利用率及制冻数量的影响并进行比较。结果显示：在四季变化中，除次均采精量要显著低于国外引进品种外，鲁西牛种公牛精液的平均密度、平均活力、精子畸形率、精液利用率及次均制冻数量均表现出一定的优势。因此，鲁西牛作为地方品种受季节变化影响最小，繁殖性能更为稳定。

Effect of Seasons on Semen Quality of Bulls from Different Varieties

To study and compare the effects of seasonal variations on semen quality including the average collected volume,the average density,the average activity,the rate of sperm deformity,the rate of semen utilization and the number of frozen semen tubule of bulls of Luxi and imported varieties,25 bulls of different breeds were selected which were 3 to 4.5 years old.The results showed that the average density,the average activity,the rate of sperm deformity,the rate of semen utilization and the number of frozen semen tubule of bulls of Luxi were significantly stronger than those of imported varieties in seasonal variations,although the average collected volume of Luxi bulls were lower than those of imported varieties.In conclusion,Luxi bull as the local breed was the least affected by seasonal changes,and its reproductive performance was the most stable.