肉牛产后早期PG二步法同期发情效果分析

Effect Analysis of PG Two-stage Synchronized Estrus Treatment during Early Period after Calving

在同一牧场随机选取产后 48～ 80 d的哺乳母牛 ,肌肉注射氯前列烯醇 0 .6mg/头 ,发情天计为 0 d,第 7d对黄体合格的牛进行胚胎移植。第 1 1 d对黄体不合格的牛及未发情的牛进行第二次肌肉注射氯前列烯醇 0 .6mg/头 ,2 0 d以后对黄体合格的发情牛再次进行胚胎移植。结果产后 48～ 60 d的牛发情率、可移植率分别比 61～ 70 d、71～ 80 d的牛低 ,( P<0 .0 2 5 ) ,可移植率差异不显著 ( P>0 .0 2 5 ) ;PG第一次处理发情率、可移植率分别比第二次处理高。有黄体的牛发情率、可移植率分别比无黄体的牛高 ,差异不显著 ( P>0 .0 2 5 )

Nine lactating cow of 48-80 d after caving were randomly selected and injected with \{0.6\} mg of PG. The first day of estrus was 0 d, on the seventh day, cow with normal yellow body were transplanted with embryos. On 11th day, cow with abnormal yellow body and anoestrus individuals were treated \{0.6\} mg per individual again, after 20 days, estrous cow with abnormal yellow body were transplanted with embryos. Results showed that estrus percentage of lactating cow of 48-80 d after caving were higher than that of lactating cow of 61-70d and 71-80 d (P<0.025), while transplantable percentage was not significantly different (P>0.025). Estrus percentage and transplantable percentage of those cows treated for the first time was higher than that of the second time. Estrus percentage and transplantable percentage of those cows with yellow body was higher than those without yellow body (P>0.025).\;