کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5535551 1551550 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Original ResearchThe Role of Equine Chorionic Gonadotropin in the Stimulation of Luteal Steroidogenesis in Mares Carrying Horse or Mule Pregnancies
ترجمه فارسی عنوان
تحقیقات اصلی نقش گونادوتروپین کورونی صورتی در تحریک استروئیدزایی لوتئال در مادران بارداری اسب یا موش
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی


- The steroidogenic effects of eCG during early pregnancy of the mare were evaluated.
- Mares impregnated by donkeys have a natural deficiency in eCG concentrations.
- They have lower levels of progesterone and androgens than mares impregnated by horses.
- Progesterone and androstenedione are clearly related to those of eCG in pregnant mares.
- eCG promotes luteal production of progesterone and androstenedione in pregnant mares.

The stimulatory role of equine Chorionic Gonadotropin (eCG) in the production of steroid hormones was evaluated during the first 4 months of pregnancy in mares impregnated by either stallions or jack donkeys. Twenty mares were divided in two groups: Mares in the first group were inseminated with stallion semen (horse pregnancies), and those in the second group were inseminated with donkey semen (mule pregnancies). Blood samples were collected twice weekly from day 30 to day 120 of pregnancy to determine the concentrations of eCG, progesterone, androstenedione, and testosterone. Analysis of variance for repeated measures was used to compare the concentrations of each hormone between groups. Linear regression models that considered the linear and quadratic effects of week of gestation as well as the linear and quadratic effects of the concentrations of eCG on the production of each steroid hormone were carried out. Concentrations of eCG, progesterone, and androstenedione were higher in horse than in mule pregnancies (P < .01 for eCG and P < .05 for progesterone and androstenedione). Testosterone concentrations were also higher in horse pregnancies than in mule pregnancies at weeks 7, 9, and 10 (P < .05). Regression analysis indicated that eCG had considerable stimulatory effects on the secretion of progesterone and androstenedione and weaker effects on the secretion of testosterone. The results suggest that eCG stimulates luteal production of progesterone, androstenedione, and testosterone in horse and mule pregnancies, these effects being more evident in horse pregnancies than in mule pregnancies due to the higher concentrations of eCG in horse pregnancies.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Equine Veterinary Science - Volume 50, March 2017, Pages 1-7
نویسندگان
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