کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2073992 | 1544788 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Disruption of the periovulatory LH surge by a transient increase in circulating 17β-estradiol at the time of ovulation in mares
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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![عکس صفحه اول مقاله: Disruption of the periovulatory LH surge by a transient increase in circulating 17β-estradiol at the time of ovulation in mares Disruption of the periovulatory LH surge by a transient increase in circulating 17β-estradiol at the time of ovulation in mares](/preview/png/2073992.png)
چکیده انگلیسی
The mechanism for a reported temporal association between ovulation and a transient disruption in the periovulatory increase in LH concentrations was studied in nine mares treated with human chorionic gonadotropin when the preovulatory follicle was â¥32 mm. Examinations for ovulation detection and blood collection were done at 2-h intervals and the results were retrospectively centralized to ovulation (Hour 0). Concentrations of LH began to increase (P < 0.03) rapidly at Hour â18, decreased (P < 0.04) between Hours 0 and 6, and again increased (P < 0.0001) after Hour 12. A progressive decrease (P < 0.0001) in estradiol between Hours â30 and 24 was interrupted temporarily by an increase (P < 0.01) between Hours â2 and 0 and a decrease (P < 0.007) between Hours 0 and 2. Results indicated that a disruption and depression in the periovulatory LH surge occurred at the time of detected ovulation in mares and was temporally associated with a transient increase in estradiol during an overall progressive decline. The disruption in LH concentrations is attributable to the estradiol increase, based on a reported negative effect of estradiol on LH. The source of the circulating estradiol was likely from the discharge of estradiol-laden follicular fluid into the abdomen during ovulation and rapid absorption of estradiol into the circulation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Reproduction Science - Volume 117, Issues 1â2, January 2010, Pages 178-182
Journal: Animal Reproduction Science - Volume 117, Issues 1â2, January 2010, Pages 178-182
نویسندگان
O.J. Ginther, M. Almamun, A.K.M. Shahiduzzaman, M.A. Beg,