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首页> 外文期刊>Tropical Animal Health and Production >Evaluation of Synchronization of Oestrus Based on Gonadotrophin-releasing Hormone and Its Potential Use for Fixed-Time Breeding in Tuli Beef Cows
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Evaluation of Synchronization of Oestrus Based on Gonadotrophin-releasing Hormone and Its Potential Use for Fixed-Time Breeding in Tuli Beef Cows

机译：基于促性腺激素释放激素的发情同步评价及其在图里肉牛定时育种中的潜在应用

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摘要

The objective of the experiment was to compare the reproductive post-partum performance of beef cows synchronized for oestrus using prostaglandin F2α (PGF2α) alone or with a gonadotrophin-releasing hormone (GnRH)-based drug. Fifty-five post-partum lactating Tuli cows were randomly allocated to three groups. Two groups were synchronized using either two injections of PGF2α (500 μg Prosolvin per injection) given 11 days apart (group 1), or GnRH (12.5 μg Receptal per injection) followed 6 days later by an injection of 500 μg PGF2α (group 2). The cows were bred by artificial insemination 12 h after they were observed in oestrus. Group 3 was synchronized as for group 2, but a second injection of GnRH was given 54 h after the PGF2α injection, at which time the cows were bred by artificial insemination (AI) without detection of oestrus. Blood samples were taken from the cows in group 3 and analysed for progesterone concentration to establish which cows were cycling and in oestrus before and at the time of breeding. Detection of oestrus and breeding by AI was done over 60 days. There were no significant differences (p>0.05) among the three groups in the first service and total conception rates. The percentage of cows in oestrus within 10 days of the synchronization treatment was not significantly different (p>0.05) between groups 1 and 2. The progesterone concentrations in the cows in group 3 showed that only those that were cycling at the start of the experiment responded to the synchronization treatment and conceived after fixed-time breeding. These results suggest that combinations of PGF2α and GnRH may be of value in synchronizing oestrus and controlling breeding in Tuli cows. However, the benefit might be greater if only cows that are known to be cycling are bred in this way.
机译：该实验的目的是比较单独使用前列腺素F2α（sub）（PGF2α）或与促性腺激素释放激素（GnRH）为基础的药物同步发情的肉牛的生殖性能。将55只产后泌乳的土里牛随机分为三组。两组使用间隔11天（第1组）的PGF2α（每次注射500μgProsolvin）或GnRH（每次注射12.5μg受体）两次注射，然后6天后注射500μgPGF2α进行同步。 （第2组）。在发情期观察到12小时后，通过人工授精将母牛繁殖。第3组与第2组同步进行，但在注射PGF2α后54 h再次注射GnRH，这时通过人工授精（AI）繁殖母牛而未发现发情。从第3组的奶牛采集血样，分析其孕酮浓度，以确定哪些奶牛在繁殖前和繁殖时在循环中和在发情期。通过AI检测发情和繁殖的过程超过60天。初次服务和总受孕率三组之间无显着差异（p> 0.05）。在第1组和第2组之间，同步处理后10天内奶牛的百分比没有显着差异（p> 0.05）。第3组中奶牛的孕酮浓度表明只有那些在实验开始时才骑自行车的人对同步处理作出反应，并在定时育种后构思。这些结果表明，PGF2α和GnRH的组合可能在同步化图里牛和控制图里牛的育种中具有价值。但是，如果仅以这种方式饲养已知会骑自行车的母牛，则收益可能会更大。

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