【摘要】 通过对不同饲养方式下的山羊共373只(A组66只,全放牧;B组89只,放牧和舍饲相结合;C组218只,全舍饲)用孕酮阴道海绵栓(PRID)结合PGF2α进行同期发情处理,试情公羊法鉴定母羊发情情况,发情结束后剖检部分山羊,检查卵巢排卵点情况,以比较不同饲养方式下的同期发情效果。结果表明:全舍饲下的山羊同期发情率为85.78%,高于放牧的66.67%、半舍饲半放牧的59.55%(P<0.01);出现发情的时间短于其他两种饲养方式(P<0.01);放牧方式下发情持续时间最长,多于半舍饲(P<0.05)和全舍饲方式(P<0.01)。B组80%(4/5)、C组86.49%(32/37)的母羊有经排卵形成的1～2个排卵点(或新生黄体)。说明饲养方式是影响山羊同期发情效果的因素之一。更多还原

【Abstract】 A total of 373 does were divided into 3 groups(Group A, 66 does grazed on the pasture; Group B, 89 does raised by concentrated supplementation combined with grazing; Group C, 218 does raised in shed ) and treated by intra-vaginal sponges containing progesterone combined with injection PGF_ 2α to synchronize estrous.After the sponges were removed, all the does were observed for signs of estrus with the buck. The results showed that estrous was present in 85.78% does in Group C 2 to 4 days after sponges were removed. It was most significantly higher than group A and B (P<0.01), the figure being 66.67% and 59.55% respectively.The time to the onset of estrus was the most significantly shorter in-group C than group A or B (P<0.01). But the time of estrous duration in-group A was significantly longer than group B (P<0.05), most significantly longer than group C (P<0.01). Through observation on the ovary, in 80% (4/5) in group B and 86.49% (32/37) in group C of the does the ovarian follicles ovulated or the new corpus luteum emerged. It showed that the way of feeding was one of the factors affecting goat estrous synchronization.更多还原