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首页> 外文期刊>Theriogenology >Effect of season, late embryonic mortality and progesterone production on pregnancy rates in pluriparous buffaloes (Bubalus bubalis) after artificial insemination with sexed semen
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Effect of season, late embryonic mortality and progesterone production on pregnancy rates in pluriparous buffaloes (Bubalus bubalis) after artificial insemination with sexed semen

机译：季节，后期胚胎死亡率和孕酮生成对性交精液人工授精后多胎水牛（Bubalus bubalis）妊娠率的影响

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The use of sexed semen technology in buffaloes is nowadays becoming more and more accepted by farmers, to overcome the burden of unwanted male calves with related costs and to more efficiently improve production and genetic gain. The aim of this study was to verify the coupling of some variables on the efficiency of pregnancy outcome after deposition of sexed semen through AI. Pluriparous buffaloes from two different farms (N = 152) were screened, selected, and subjected to Ovsynch protocol for AI using nonsexed and sexed semen from four tested bulls. AI was performed in two distinct periods of the year: September to October and January to February. Neither farms nor bulls had a significant effect on pregnancy rates pooled from the two periods. The process for sexing sperm cells did not affect pregnancy rates at 28 days after AI, for nonsexed and sexed semen, respectively 44/73 (60.2%) and 50/79 (63.2%), P = 0.70, and at 45 days after AI, for nonsexed and sexed semen, respectively 33/73 (45.2%) and 33/79 (49.3%), P = 0.60. Pregnancy rate at 28 days after Al during the transitional period of January to February was higher when compared with September to October, respectively 47/67 (70.1%) versus 47/85 (55.2%), P = 0.06. When the same pregnant animals were checked at Day 45 after AI, the difference disappeared between the two periods, because of a higher embryonic mortality, respectively 32/67 (47.7%) versus 40/85 (47.0%), P = 0.93. Hematic progesterone concentration at Day 10 after Al did not distinguish animals pregnant at Day 28 that would or would not maintain pregnancy until Day 45 (P = 0.21). On the contrary, when blood samples were taken at Day 20 after AI, the difference in progesterone concentration between pregnant animals that would maintain their pregnancy until Day 45 was significant for both pooled (P = 0.00) and nonsexed (P = 0.00) and sexed semen (P = 0.09). A similar trend was reported when blood samples were taken at Day 25, being highly significant for pooled, nonsexed, and sexed semen (P = 0.00). Hematic progesterone concentration between the two periods of the year was highly significant for pregnant animals at 28 days from Al when blood samples were taken at Day 20 after Al for pooled, nonsexed, and sexed semen, respectively P = 0.00, 0.00, and 0.06, and for pregnant animals at Day 45 for pooled, nonsexed, and sexed semen, respectively P = 0.00, 0.00, and 0.01. From these results, it can be stated that hematic progesterone concentration measurement since Day 20 after Al can be predictive of possible pregnancy maintenance until Day 45. Furthermore, the transitional period of January to February, although characterized by a higher pregnancy outcome when compared with September to October, suffers from a higher late embryonic mortality as evidenced by a significant different hematic progesterone concentration between the two periods at Day 20 after AI. (C) 2013 Elsevier Inc. All rights reserved.
机译：如今，水牛中使用有性精液技术越来越被农民所接受，它可以用相关的成本克服雄性不育小牛的负担，并更有效地提高产量和遗传增益。这项研究的目的是验证通过AI沉积有性精液后某些变量对妊娠结局效率的影响。对来自两个不同农场（N = 152）的多头水牛进行筛选，选择，并使用来自四只经过测试的公牛的无性和有性精液进行AI同步处理。一年中有两个不同的时期进行了AI：9月至10月和1月至2月。农场和公牛对这两个时期的妊娠率均无显着影响。在AI后28天，对精子细胞进行性别区分的过程对怀孕率没有影响，对于未性别和性别的精液，分别为44/73（60.2％）和50/79（63.2％），P = 0.70，以及AI之后45天非性和有性精液分别为33/73（45.2％）和33/79（49.3％），P = 0.60。与9月至10月相比，1月至2月过渡期Al出院后28天的妊娠率分别为47/67（70.1％）和47/85（55.2％），P = 0.06。当在AI后第45天检查相同的怀孕动物时，两个时期之间的差异消失了，因为较高的胚胎死亡率分别为32/67（47.7％）和40/85（47.0％），P = 0.93。 A1后第10天的血中孕激素浓度不能区分在第28天怀孕的动物是否会保持怀孕直到第45天（P = 0.21）。相反，当在AI后第20天采集血样时，将维持妊娠直至第45天的妊娠动物之间的孕酮浓度差异对于合并（P = 0.00）和未性别（P = 0.00）以及有性别的人均显着精液（P = 0.09）。据报道，在第25天采集血样时，出现了类似的趋势，这对于合并的，没有性别的和有性的精液具有非常重要的意义（P = 0.00）。在从Al开始的第28天，当在Al的第20天采血时，混合，无性和有性精液的血液样本中，怀孕的动物在从Al开始的第28天时的血孕酮浓度非常高，分别为P = 0.00、0.00和0.06，在第45天时，对于合并，无性和有性精液的怀孕动物，P = 0.00、0.00和0.01。从这些结果可以看出，自A1后第20天开始测量血中孕酮浓度可以预测直到45天之前可能的妊娠维持。此外，从1月到2月的过渡期，虽然与9月相比具有较高的妊娠结局。在AI结束后的第20天，两个时期的血中孕酮浓度存在显着差异，这证明了在10月至10月期间遭受较高的晚期胚胎死亡率。 （C）2013 Elsevier Inc.保留所有权利。

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