摘要
Abstract
In order to explore the effects of different factors on the semen quality of boars and the reproductive performance of sows,62 Du-roc boars,74 Landrace boars,221 Large White boars,288 Duroc sows,247 Landrace sows,and 1 951 Large White sows were selected from a boar breeding station in Guangxi as the experimental population.The effects of breed,semen collection month,semen collection age,and semen collection interval on semen volume,semen density,sperm motility,and effective sperm count were determined by mixed linear mod-els and analysis of variance.The effects of the effective sperm input during estrus,sperm motility,mating season,breed,and parity on the conception rate and total litter size of sows were also analyzed.The results were as follow:The semen volume and effective sperm count of Large White boars were higher than those of Landrace and Duroc boars(P＜0.05 or P＜0.01),and the semen density of Duroc boars was sig-nificantly higher than that of Landrace and Large White boars(P＜0.05).In terms of time,the semen density was highest in spring and the effective sperm count was lowest in summer,while the semen volume and effective sperm count were highest in autumn and winter(P＜0.05 or P＜0.01).In terms of age,the younger the age of the boar,the lower the semen volume and the fewer the effective sperm count collected(P＜0.01).In terms of interval,the semen volume,semen density,and sperm motility of boars from all three breeds showed an overall in-creasing trend with longer semen collection intervals,with the best comprehensive performance at a semen collection interval of 5 days.The effective sperm input during estrus significantly affected the conception rate and total litter size of Duroc sows(P＜0.05),while spermmotili-ty significantly affected the conception rate,total litter size,and live litter size of Duroc,Landrace,and Large White sows(P＜0.05).How-ever,increasing the effective sperm input during estrus did not increase the total litter size of Landrace and Large White sows(P＞0.05).In summary,breed,semen collection month,semen collection age,and semen collection interval all affected the quality of boar semen.Increas-ing the effective sperm input during estrus only improved the conception rate and total litter size of Duroc sows,while improving sperm motili-ty raise the conception rate and total litter size of Duroc,Large White,and Landrace sows.关键词
公猪/精液质量/母猪/分娩率/产仔数Key words
boar/semen quality/sow/delivery rate/litter size分类
农业科技
