【摘要】 选择420头体况维持在2.0~3.0的当年产犊乏情母牦牛分3个组,用3种不同的方法进行诱导发情处理。第1组:注射GnRH-PG-GnRH;第2组:注射GnRH-PG-E2;第3组:注射PG-GnRH。结果表明:第1组、第2组和第3组经不同的处理后,发情率分别为70.00%(98/140)、54.29%(76/140)、52.14%(73/140),受胎率分别为48.57%(68/140)、34.28%(48/140)、21.43%(30/140)。第1组发情率分别显著高于其它2个组(P<0.05);采用GnRH-PG-GnRH处理方案,通过三年扩大试验,发现牦牛平均发情率在66.67%(72/108)以上,受胎率在44.44%(48/108)以上。更多还原

【Abstract】 420 female yaks with low estrus,producing calf in the same year,and maintaining body condition at 2. 0 ~ 3. 0 were divided into 3 group. 3 kinds of ways were adopted to induce estrus. Injections of GnRH- PG- GnRH for group 1; Injections of GnRH- PG- E2 for group 2; Injections of PG- GnRH for group3. The results showed that the estrus rate and conception rate of group 1,2 and 3 group after different treatment were 70. 00%( 98 /140), 54. 29%( 76 /140),52. 14%( 73 /140),and 48. 75%( 68 /140),34. 28%( 48 /140),21. 43%( 30 /140) respectively. The estrus rate of group 1 were significantly higher than other two groups( p < 0. 05); The GnRH- PG- GnRH treatment scheme,through three years promotion experiment,it found the average estrus rate and conception rate were above 66. 67%( 72 /108),and above 44. 44%( 48 /108) respectively.更多还原