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首页> 外文学位 >STEROID HORMONE PROFILES IN PERIPARTURIENT MARES AT DIFFERENT LEVELS OF BODY CONDITION (ESTROGENS, EQUINE, PROGESTERONE, FAT)
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STEROID HORMONE PROFILES IN PERIPARTURIENT MARES AT DIFFERENT LEVELS OF BODY CONDITION (ESTROGENS, EQUINE, PROGESTERONE, FAT)

机译：身体状况不同水平（雌激素，马，孕激素，脂肪）周围蠕动母体中的甾体激素谱

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摘要

Serum steroid hormone profiles were investigated in mares foaling at different levels of body condition. Six mares (Thin) were managed to lose weight during late gestation and foal in thin condition (condition score (LESSTHEQ) 4.5; scale 1-9) and six mares (Control) were managed such that they foaled in good condition ((GREATERTHEQ)6). Weight, body condition and rump fat thickness were measured weekly. Serum samples collected twice weekly prepartum and daily postpartum were analyzed for progesterone (P4), estrone (E1) and estradiol-17(beta) (E2) by RIA. Peak serum estrogen levels were correlated with peak serum bio (BLH) and immunoactive luteinizing hormone (ILH) levels in periestrous mares. Postpartum reproductive efficiency was determined by monitoring intervals to estrus and ovulation and by conception rates.;Gestation length was longer in Thin compared to Control mares (352 (+OR-) 1.6 d and 343 (+OR-) 2.3 d, respectively). Serum P4 was higher in Thin than in Control mares (P < .02) during the 4th and 3rd weeks before foaling. However, P4 in Thin mares declined during the last 2 weeks before foaling, then increased prior to foaling while serum P4 increased steadily in Control mares. Serum E1 and E2 decreased in both groups during the final 5 weeks of gestation except that E2 increased a few days before foaling in Control mares. Serum E1 during weeks 5, 3 and 2 prepartum, and serum E2 during weeks 5, 4, 3 and 2 prepartum were greater in Thin than in Control mares (P < .03).;Interval between foaling and the end of the first luteal phase was increased (P < .05) in Thin compared to Control mares. Serum P4 concentrations were lower in Thin than in Control mares (P < .01) during the first and second luteal phase. Serum E1 levels between parturition and the first luteal phase were higher (P < .001) in Thin than in Control mares as were serum E2 levels.;Based on these data, mares foaling in thin condition have longer gestation intervals, altered P4 profiles before foaling, elevated serum E1 and E2 concentrations prepartum and during the first postpartum estrous cycle and reduced circulating levels of P4 during the luteal phase. Significant reduction in stored body fat may alter steroid metabolism and/or alter the hypothalamic-pituitary-gonadal axis such that reproductive functions are impaired. (Abstract shortened with permission of author.).
机译：在不同水平的身体条件下对母马驹进行血清类固醇激素谱的研究。六个母马（瘦）在妊娠后期体重减轻，并且在稀薄条件下驹（状况得分（LESSTHEQ）4.5；等级1-9），并且管理六个母马（对照），使其状况良好（驹（GREATERTHEQ） 6）。每周测量体重，身体状况和臀部脂肪厚度。每周两次，产前和产后每天两次收集的血清样品通过RIA分析孕酮（P4），雌酮（E1）和雌二醇-17β（E2）。雌马峰值血清雌激素水平与血清​​雌激素（BLH）和免疫活性黄体生成激素（ILH）水平相关。产后生殖效率是通过监测发情和排卵的间隔以及受孕率来确定的。Thin的妊娠期长于对照母马（分别为352（+ OR-）1.6 d和343（+ OR-）2.3 d）。产前4周和3周，瘦肉中的血清P4高于对照组母猪（P <.02）。但是，细母马中的P4在产驹前的最后两周内下降，然后在产驹前增加，而对照母猪中的血清P4稳定地增加。在妊娠的最后5周，两组的血清E1和E2均下降，除了对照组母马产驹前几天E2升高。稀薄母猪在产前5、3、2周的血清E1和产前5、4、3、2周的血清E2均大于对照母猪（P <.03）。小马驹与第一个黄体末端之间的间隔与对照母马相比，​​“瘦”期的相数增加（P <.05）。在第一个和第二个黄体期，Thin的血清P4浓度低于对照母马（P <.01）。稀薄的母马在分娩至黄体第一期之间的血清E1水平高于对照母马（P <.001），血清E2水平也高于对照母马。基于这些数据，稀薄条件下母马产驹的妊娠间隔更长，P4谱在产后，产前第一个发情周期中血清E1和E2浓度升高，黄体期P4循环水平降低。体内脂肪的大量减少可能会改变类固醇的代谢和/或改变下丘脑-垂体-性腺轴，从而损害生殖功能。 （摘要经作者许可缩短。）。

著录项

  • 作者

    HODGE, SAUNDRA LEIGH.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Animal sciences.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 90 p.
  • 总页数 90
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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