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首页> 外文OA文献 >Progesterone concentration, pregnancy and calving rate in Simmental dairy cows after oestrus synchronisation and hCG treatment during the early luteal phase
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Progesterone concentration, pregnancy and calving rate in Simmental dairy cows after oestrus synchronisation and hCG treatment during the early luteal phase

机译：黄体期早期发情同步和hCG治疗后西门塔尔奶牛的孕酮浓度，妊娠和产犊率

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Early embryonic development may be negatively affected by insufficient progesterone (P4) production. Therefore, the aim of our study was to increase P4 by gonadotropin-releasing hormone (GnRH) and/or human chorionic gonadotropin (hCG) treatments after inducing oestrus by prostaglandin (PG) treatment. Lactating Simmental dairy cows (n = 110), between 1 to 5 lactations, with an average milk production of 6,500 1/305 days, at 40–80 days postpartum were used and grouped as follows: (1) PG + GnRH treatment at AI (GnRH group), (2) PG + hCG treatment at day 7 after AI (hCG group), (3) PG + GnRH at AI + hCG treatment at day 7 after AI (GnRH/hCG group), and (4) spontaneous oestrus (C: control group). All animals were double inseminated (at the time of oestrus detection and 12 ± 2 h thereafter). Blood serum and milk samples were collected at the day of observed oestrus (day 0), and 14, 21 and 28 days after AI. Serum P4 was determined using a commercial radioimmunoassay (RIA) test (INEP, Zemun), and milk P4 was determined using enzyme-linked immunoassay (ELISA) test (NIV Novi Sad). Pregnancy status was confirmed by ultrasonography between days 28 and 35 after AI. Differences of serum or milk P4 medians, pregnancy (and calving) rate were determined using Dunn’s Multiple Comparison Tests and Z test, respectively. Serum P4 medians were significantly higher at days 14, 21 and 28 after AI in the hCG-treated animals, indicating increased luteal activity, with a similar tendency in whole milk P4 values. Treatment with hCG during the early luteal phase significantly contributed to the maintenance of gestation at days 28–35 after AI, and also increased the calving rate in Simmental dairy cows.
机译：孕酮（P4）产量不足可能会对早期胚胎发育产生负面影响。因此，我们的研究目的是通过前列腺素（PG）治疗诱导发情后，通过促性腺激素释放激素（GnRH）和/或人绒毛膜促性腺激素（hCG）治疗增加P4。使用哺乳期1至5次的西门塔尔奶牛（n = 110），产后40–80天平均产奶量为6,500 1/305天，分组如下：（1）AI进行PG + GnRH处理（GnRH组），（2）AI后第7天进行PG + hCG治疗（hCG组），（3）AI后7天进行AI + hCG治疗时的PG + GnRH（GnRH / hCG组）和（4）自发发情（C：对照组）。对所有动物进行双授精（在发情检测时和此后12±2小时）。在观察到的发情日（第0天）以及AI后14、21和28天收集血清和牛奶样品。使用商业放射免疫分析（RIA）测试（INEP，Zemun）确定血清P4，使用酶联免疫分析（ELISA）测试（NIV Novi Sad）确定牛奶P4。 AI后28到35天之间，通过超声检查确认了怀孕状态。分别使用Dunn的多重比较检验和Z检验确定血清或牛奶P4中位数，妊娠（和产犊）率的差异。在hCG处理的动物中，AI后第14、21和28天，血清P4的中位数显着更高，表明黄体活性增加，全脂P4值的趋势相似。在黄体早期，用hCG进行治疗可显着促进AI后28-35天的妊娠维持，并提高西门塔尔奶牛的产犊率。

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