银狐的繁殖年龄和配种日期对繁殖性能的影响

摘要

本试验通过对816只母银狐的1195个繁殖记录和51只公狐的211个繁殖记录进行了整理,统计分析了母银狐配种日期及公、母银狐年龄对主要繁殖性能的影响.结果表明:在唐山地区,母银狐2月29日前发情配种,产胎率和胎断奶成活仔兽数较高,而3月16日以后发情配种,其繁殖效率大大降低；1岁和5岁公银狐比2到4岁公银狐的配种或采精次数低,但1岁公银狐所配母银狐的平均受胎率和胎断奶成活仔兽数均高于其它年龄公银狐所配母银狐.%The 1195 records from 816 female and 211 records from 51 male silver foxes were used to evaluate the effects of age and mating date on reproductive performance in silver foxes. The results showed that the conception rate and litter size at weaning were improved when the female foxes were mated before Feb 29, while the reproductive performance was reduced if the mating date was later than March 16 in Tangshan district of Hebei province. The numbers of mating or semen collection were lower when the male foxes were 1 or 5 years old than the other ages, however, the conception rate and litter size at weaning of female foxes were higher when the male foxes were 1 year old compared with other ages.