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首页> 外文期刊>Veterinary World >Pattern of induced estrus and conception rate following Ovsynch and Ovsynch based gonadotropin-releasing hormone treatments initiated on day 6 of estrous cycle in repeat breeding crossbred cows
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Pattern of induced estrus and conception rate following Ovsynch and Ovsynch based gonadotropin-releasing hormone treatments initiated on day 6 of estrous cycle in repeat breeding crossbred cows

机译：在重复育种的杂交母牛的发情周期第6天开始进行Ovsynch和基于Ovsynch的促性腺激素释放激素治疗后的诱导发情和受精率模式

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Aim: The aim was to evaluate the estrus response, incidence of accessory corpus luteum formation and fertility following different hormonal protocols in repeat breeding crossbred cows. Materials and Methods: This study was carried out on 24 repeat breeding crossbred cows allotted into four groups. Cows of Group I was not given any treatment, Group II was treated with gonadotropin-releasing hormone (GnRH) injection on day 6 post-estrus, Group III was treated with Ovsynch protocol, and Group IV was treated with Ovsynch based GnRH treatment. Estrus responses such as duration, onset, percentage, and intensity of estrus were recorded during the study. The incidence of accessory corpus luteum was recorded per rectally on day 7 after first and additional GnRH of Ovsynch treatment. The conception rate for all groups was calculated by the absence of estrus and on day 45 after artificial insemination (AI) per rectum. Serum samples were collected at AI and day 12 post-AI in Group I and II. Serum samples were also collected at GnRH, Prostaglandin F2α (PGF2α), timed AI (TAI) and day 12 post-TAI in Group III and IV. Results: Ovsynch and Ovsynch based GnRH treatments are resulted in 100.00% induction of estrus after the PGF2α injection. Onset of induced estrus after the PGF2α injection for Group III and IV was recorded as 48.750?0.713 and 51.472?1.989 h, respectively, and it was not significant. There was no significant difference in duration of estrus among the groups. The incidence of intermediate estrus intensity was found to be highest. All the cows showed the incidence of formation of accessory corpus luteum subsequent to GnRH treatment on day 6 of the estrous cycle in Group II, III, and IV. The conception rate was 0.00%, 16.67%, 50.00%, and 50.00% in Group I, II, III, and IV, respectively. Conclusion: Ovsynch and Ovsynch based GnRH treatments initiated on day 6 of estrous cycle capable of responding with a higher percentage of ovulation and formation of accessory corpus luteum which helped in higher conception rate over single post-AI GnRH treatment in repeat breeders. These treatments responded with better estrus response but did not significantly improve estrus intensity.
机译：目的：目的是评估在重复育种杂交母牛中，不同激素方案后的发情反应，黄体副体形成的发生率和生育力。材料与方法：本研究是对24只重复育种的杂交母牛进行的，该母牛被分为四组。第一组的母牛未接受任何治疗，第二组在发情后第6天接受促性腺激素释放激素（GnRH）注射治疗，第三组采用Ovsynch方案治疗，第四组采用基于Ovsynch的GnRH治疗。在研究期间记录发情反应，例如持续时间，发作，发情百分比和强度。在卵巢同步化治疗的第一个和额外的GnRH后第7天，每直肠记录黄体副体的发生率。所有组的受孕率是通过不发情和在每个直肠人工授精（AI）后第45天计算的。 I和II组在AI和AI后第12天收集血清样品。在III和IV组中，还在GnRH，前列腺素F2α（PGF2α），定时AI（TAI）和TAI后第12天收集血清样品。结果：注射PGF2α后，基于Ovsynch和基于Ovsynch的GnRH治疗可引起发情的100.00％诱导。第三组和第四组注射PGF2α后的诱导发情发作分别记录为48.750？0.713和51.472？1.989h，但无统计学意义。各组之间的发情持续时间没有显着差异。发现中间发情强度的发生率最高。在组II，III和IV中，在动情周期的第6天，所有牛在GnRH治疗后均显示出黄体副体的形成。第一组，第二组，第三组和第四组的受孕率分别为0.00％，16.67％，50.00％和50.00％。结论：在动情周期的第6天开始进行Ovsynch和基于Ovsynch的GnRH治疗，它们能够以更高的排卵百分比和黄体形成辅助体，从而对重复育种的单个AI后GnRH治疗产生更高的受孕率。这些治疗对发情的反应较好，但并未显着改善发情强度。

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