首页> 外文期刊>Tropical Animal Health and Production >Ovarian evaluation of Girolando (Holstein x Gir) heifers submitted to a GnRH-PGF(2 alpha)-GnRH protocol in the dry or rainy seasons in the tropical savannah
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Ovarian evaluation of Girolando (Holstein x Gir) heifers submitted to a GnRH-PGF(2 alpha)-GnRH protocol in the dry or rainy seasons in the tropical savannah

机译:在热带大草原的干旱或雨季中,Girolando(Holstein x Gir)小母牛对GnRH-PGF(2 alpha)-GnRH方案的卵巢评估

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The Girolando breed is used in pasture-based dairy production systems in Brazil to associate the high production of Bos taurus to the rusticity and thermal adaptation of Bos indicus. This study was designed to evaluate the physiological response to a gonadotropin-releasing hormone (GnRH)-prostaglandin F-2 alpha (PGF(2 alpha))-GnRH protocol to synchronize the ovulation in 40 Girolando heifers of a pasture-based dairy production system and its relationships with the temperature and humidity index (THI) during the dry (DS) and rainy season (RS) in the tropical savannah-Brazil's cerrado biome. Responses were characterized by follicular and corpus luteum number and diameter, ovulation (D9), and pregnancy rates after first AI. Total follicle number (8.1 +/- 0.3 x 8.8 +/- 0.3), D9 ovulatory follicle diameter (11.9 +/- 0.4 x 10.1 +/- 0.4 mm), corpus luteum diameter (8.6 +/- 1.3 x 3.9 +/- 1.5 mm), corpus luteum score (3.7 +/- 0.8 x 1.8 +/- 1.0), corpus luteum diameter after AI (9.6 +/- 1.6 x 3.9 +/- 1.5 mm), and corpus luteum score after AI (3.2 +/- 0.4 x 0.9 +/- 0.6) in DS and RS differed (P < 0.01). D9 ovulation rate was 40 % (DS) and 20 % (RS), without differences (P > 0.05). Pregnancy rate was 45 % (DS) and 11 % (RS), with differences (P < 0.01). THI differed between DS and RS (P < 0.01). THI may interfere in the follicular and luteal dynamics and in the response of Girolando heifers to the GnRH-PGF(2 alpha) protocol in the tropical savannah, thus reducing the chances of pregnancy at the first artificial insemination.
机译:Girolando品种用于巴西以牧场为基础的乳制品生产系统中,使Bos taurus的高产量与Bos indicus的质朴性和热适应性相关。这项研究旨在评估对促性腺激素释放激素(GnRH)-前列腺素F-2 alpha(PGF(2 alpha))-GnRH方案的生理反应,以同步基于牧场的乳制品生产系统的40个Girolando小母牛的排卵及其与热带大草原-巴西塞拉多生物群系在干旱(DS)和雨季(RS)期间的温度和湿度指数(THI)的关系。反应的特征是首次AI后卵泡和黄体的数目和直径,排卵(D9)和妊娠率。总卵泡数(8.1 +/- 0.3 x 8.8 +/- 0.3),D9排卵卵泡直径(11.9 +/- 0.4 x 10.1 +/- 0.4毫米),黄体直径(8.6 +/- 1.3 x 3.9 +/-) 1.5毫米),黄体评分(3.7 +/- 0.8 x 1.8 +/- 1.0),AI后的黄体直径(9.6 +/- 1.6 x 3.9 +/- 1.5 mm)和AI后的黄体评分(3.2 + DS和RS中的差异为(-0.4 x 0.9 +/- 0.6)(P <0.01)。 D9排卵率分别为40%(DS)和20%(RS),无差异(P> 0.05)。妊娠率分别为45%(DS)和11%(RS),差异有统计学意义(P <0.01)。 DS和RS之间的THI有所不同(P <0.01)。 THI可能会干扰热带大草原中的卵泡和黄体动力学以及Girolando小母牛对GnRH-PGF(2 alpha)协议的反应,从而减少了首次人工授精的怀孕机会。

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