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首页> 外文期刊>Tropical Animal Health and Production >Effect of estrus synchronization protocols on plasma progesterone profile and fertility in postpartum anestrous Kankrej cows
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Effect of estrus synchronization protocols on plasma progesterone profile and fertility in postpartum anestrous Kankrej cows

机译：发情同步协议对产后发情的Kankrej奶牛血浆孕酮谱和生育力的影响

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The study was aimed at induction/synchronization of estrus in postpartum anestrous Kankrej cows of zebu cattle maintained at an organized farm. The study included use of different hormone protocols, viz., Ovsynch, CIDR (controlled internal drug release), Ovsynch plus CIDR, and Heatsynch with estimation of plasma progesterone on days 0, 7, 9/11 (artificial insemination—AI) and on day 20 post-AI following fixed time insemination. Thirty selected anestrous animals were divided into five equal groups (four treatment and one control), and the findings were compared with the normal cyclic control group of six cows. All the protocols were initiated in cows with postpartum anestrous period of more than 4 months, considering the day of first GnRH injection or CIDR insertion as day 0. The animals were bred by fixed time artificial insemination. Pregnancy was confirmed per rectum on day 60 post-AI in non-return cases. The conception rates at induced/first heat in Ovsynch, CIDR, Ovsynch + CIDR, and Heatsynch protocols were 33.33, 66.66, 50.00 and 16.67%, respectively. The corresponding overall conception rates of three cycles post-treatment were 50.00% (3/6), 100.00% (6/6), 66.66% (4/6), and 50.00% (3/6). In normal cyclic and anestrous control groups, the pooled pregnancy rates were 83.33% (5/6) and 16.67% (1/6), respectively. The pooled mean plasma progesterone (nanograms per milliliter) concentrations were significantly (P < 0.05) higher on day 7 in Ovsynch (5.727 ± 1.26), CIDR (4.37 ± 0.66), Ovsynch plus CIDR (3.55 ± 0.34), and Heatsynch (5.92 ± 1.11) protocols as compared with their corresponding values obtained on days 0, 9/11 (AI), and on day 20 post-AI. In anestrous control group, the mean progesterone concentration at the beginning of experiment was 0.67 ± 0.33 ng/ml, which was at par with values of all other groups. The overall plasma progesterone levels on the day of initiating treatment were low in all groups, with smooth small inactive ovaries palpated per rectum twice at 10 days interval, suggesting that most of the animals used in the study were in anestrous phase. Mean (±SE) values of plasma progesterone (nanograms per milliliter) on day 20 post-AI were higher in conceived cows than the non-conceived cows of all the groups, but differed significantly (P < 0.05) only in normal cyclic group. These results suggest that use of different hormone protocols particularly Ovsynch, CIDR, and Ovsynch + CIDR may serve as an excellent tool for induction and synchronization of estrus and improvement of conception rate in postpartum anestrous Kankrej cows.
机译：这项研究的目的是在一个有组织的农场维持的产犊牛的Kenkrej产后无情奶牛的发情诱导/同步。该研究包括使用不同的激素方案，即Ovsynch，CIDR（受控内部药物释放），Ovsynch加CIDR和Heatsynch，并在第0、7、9 / 11天（人工授精-AI）及以后评估血浆孕酮。固定时间授精后的AI后第20天。将选择的三十只动情动物分为五个相等的组（四个处理组和一个对照组），并将发现的结果与正常的六头牛的对照组进行比较。考虑到首次注射GnRH或插入CIDR的天为第0天，所有方案均在产后动情超过4个月的母牛中开始。通过固定时间的人工授精饲养动物。在非返回病例中，在AI后第60天确认了每个直肠的妊娠。在Ovsynch，CIDR，Ovsynch + CIDR和Heatsynch协议中，诱导/初生时的受精率分别为33.33、66.66、50.00和16.67％。治疗后三个周期的相应总体受孕率分别为50.00％（3/6），100.00％（6/6），66.66％（4/6）和50.00％（3/6）。在正常的周期性和动情对照组中，合并妊娠率分别为83.33％（5/6）和16.67％（1/6）。在第7天，Ovsynch（5.727±1.26），CIDR（4.37±0.66），Ovsynch加CIDR（3.55±0.34）和Heatsynch（5.92）的合并平均血浆孕酮浓度（毫微克/毫升）显着（P <0.05）更高。 ±1.11）方案，与在AI后第0天，9/11（AI）和第2​​0天获得的相应值进行比较。在动情对照组中，实验开始时的孕酮平均浓度为0.67±0.33 ng / ml，与所有其他组的值相同。在所有治疗组中，开始治疗当天的血浆孕酮水平均较低，每隔10天两次触诊每个直肠两次触诊的平滑小而无活性的卵巢，表明该研究中使用的大多数动物处于发情期。人工授乳后第20天血浆孕酮的平均（±SE）值（纳克每毫升）在所有组中均比未受孕的牛高，但仅在正常循环组中有显着差异（P <0.05）。这些结果表明，使用不同的激素方案，尤其是Ovsynch，CIDR和Ovsynch + CIDR，可以作为诱导和同步发情以及提高产后无情Kankrej母牛受胎率的极佳工具。

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