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首页> 外文期刊>The Indian Journal of Animal Reproduction >EFFECT OF GNRH AGONIST AT DIFFERENT STAGES OF THE PGF2a INDUCED ESTROUS CYCLE IN REPEAT BREEDER COWS
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EFFECT OF GNRH AGONIST AT DIFFERENT STAGES OF THE PGF2a INDUCED ESTROUS CYCLE IN REPEAT BREEDER COWS

机译：GNRH激动剂在PGF2a诱导的重复性育种牛母牛不同周期中的作用

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摘要

Forty repeat breeder cows were randomly allotted into four groups and were induced to estrus with 25mg of PGF_(2a), intramuscularly on day 10 of the estrous cycle. After estrus induction, group I was not given any treatment. Cows of group II, III andIV were treated with 20ug of GnRH agonist, intramuscularly at 48 and 72 h after PGF2a administration and day 5 post insemination respectively. Breeding was done with good quality frozen semen for all the groups at 72 and 96 h after PGF_(2a) administration. The time taken for the onset of estrus and duration of estrus in group II was shorter (P<0.01) than the other groups. The incidence of weak estrus was significantly higher in group II while the incidence of intense and intermediate estrus was significantly higher in group III when compared with other groups. The group IV had significantly longer oestrous cycle length (P<0.01) than the other groups. The serum progesterone concentration did not differ significantly (P>0.05) on day 0 in any of the groups, but was significantly higher (P<0.05) in group II at 72 h after PGF_(2a) injection, in group III on day 5, and in group IV on day 10 and 16 post insemination. The conception rate in the first service was higher in group III, the second service and overall conception rate was higher in group IV. It can be inferred from the present study that PGF_(2a) synchronized estrus combined with GnRH 72h after PGF_(2a) administration and on day 5 post-insemination were found to have achieved fairly a good overallconception rate in repeat breeder cows.
机译：在发情周期的第10天，将40只重复繁殖的母牛随机分为四组，并用25mg的PGF_（2a）肌肉内诱导发情。发情诱导后，第一组未接受任何治疗。在分别给予PGF2a后48小时和72小时，分别在第48、72 h分别对20，II，III和IV组奶牛进行了肌内GnRH激动剂治疗。在给予PGF_（2a）后的第72和96小时，所有组均以优质冷冻精液进行繁殖。与其他组相比，第二组发情的时间和发情的持续时间要短（P <0.01）。与其他组相比，第二组中弱发情的发生率显着较高，而第三组中强发情和中发情的发生率显着更高。第四组的雌性周期长度明显长于其他组（P <0.01）。各组在第0天的血清孕酮浓度无明显差异（P> 0.05），但在注射PGF_（2a）后72 h，第II组的第5天III组的血清孕酮浓度显着高于（P <0.05）。 ，并在授精后第10和16天的第IV组中。第三组第一次服务的受孕率较高，第四组第二次服务和总体受孕率较高。从本研究中可以推断，在施用PGF_（2a）后和授精后第5天，发现PGF_（2a）同步发情联合GnRH 72h，在复种母牛中获得了相当好的总体受孕率。

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