母猪诱导发情及排卵效果研究

研究不同方法对母猪的诱导发情及排卵效果的影响。采用三种处理方法对母猪进行了诱导发情及排卵研究。结果表明，PMSG+HCG组的诱导发情率与情期受胎率均极显著（P﹤0.01）高于三合激素组、显著（P﹤0.05）高于PMSG组，且PMSG组的诱导发情率与情期受胎率均显著（P﹤0.05）高于三合激素组；经PMSG+HCG方法诱导发情处理的母猪，其发情高峰发生在注药后48~96h，母猪发情呈现明显的同期化；PMSG+HCG方法处理母猪后，可以提高母猪的产仔数及活仔数，且对受胎率无影响；进一步观察母猪排卵及胚胎发育状况表明，PMSG+HCG方法对母猪进行诱导发情及排卵并没有影响胚胎的质量，胚胎开始进入子宫的时间发生在母猪配种后60h以前，此时，胚胎处于4细胞期。说明采用促性腺激素对母猪的诱导发情效果要明显好于性腺激素，且采用适宜剂量的PMSG与HCG混合注射来诱导母猪发情及排卵是完全可行的。

Effect of Estrus and Ovulation Induction of Sows

Different methods was used to study the effect of the estrus and ovulation induction of sows in this paper. Three methods were applied to research the estrus and ovulation induction of sows. The results showed that the estrous rate and conception rate using PMSG+HCG method were extremely different（P﹤0.01）from those of trio-mixture hormone method, and significant difference（P﹤0.05）from those of PMSG method, and the estrous rate and conception rate of PMSG method were significant difference（P﹤0.05）from those of trio-mixture hormone method. The estrous peak of sows treated by PMSG+HCG method was 48~96 hour after injected hormone, and the estrus of sows presented the obvious synchronization. The litter size and the number of alive piglets of sows were improved by using PMSG+HCG method, but conception rate of sows weren’t influenced by this method. The observation of the ovulation and early-embryos’ development of sows showed that the quality of embryos wasn’t influenced upon when PMSG+HCG method was used to be estrus and ovulation induction of sows. The embryos began to enter womb before 60h after sows accepted mating of the boar, and they should be in 4 cell stage in this time. The results explained that the effect of gonadotropin on estrus induction of sows were better than that of sex hormone. It was feasible that the estrus and ovulation of sows were induced by injecting the appropriate dose of PMSG and HCG.