کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10893222 | 1082187 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reproduction in high body condition mares with high versus low leptin concentrations
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Previous results from our laboratory indicated that a majority of mares with high body condition scores (BCS) displayed estrous cycles or had considerable follicular activity during the winter. Among these high BCS mares, about 35% of them exhibited a persistent hyperleptinemia and hyperinsulinemia. The current experiment was designed to compare the reproductive characteristics of high BCS mares with hyperleptinemia to those with normal (low) plasma concentrations of leptin during the winter and the first estrous cycle (or the first full cycle encountered for those already cycling). Light horse mares with high BCS (6-8.5) were assigned to groups based on leptin concentrations (8/group): low (<5Â ng/mL) and high (>10Â ng/mL). Beginning 7 January, mares were assessed every 3Â d for follicular activity and then daily once a follicle >25Â mm was detected. Mares were subsequently monitored through their first and second ovulations. Leptin concentrations remained higher (PÂ <Â 0.001) in mares in the high leptin group over the duration of the experiment. Also, high leptin mares had greater (PÂ <Â 0.0001) insulin response to glucose infusion and a faster (PÂ <Â 0.05) rate of glucose clearance. One mare with high leptin and three mares with low leptin had progesterone concentrations indicative of the presence of a corpus luteum at the onset of the experiment. Plasma concentrations of LH, FSH, and progesterone did not differ between groups (PÂ >Â 0.1) during the first estrous cycle occurring after 7 January. Date of first ovulation after 7 January and interovulatory interval were similar (PÂ >Â 0.1) for the two groups, as were estimates of follicular numbers on the ovaries (small, medium, and large; PÂ >Â 0.1). It is concluded that the perturbations in leptin and insulin secretion observed in some high BCS mares are not associated with alterations in ovarian activity or the estrous cycle during winter and into the period of vernal transition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theriogenology - Volume 66, Issue 4, 1 September 2006, Pages 923-928
Journal: Theriogenology - Volume 66, Issue 4, 1 September 2006, Pages 923-928
نویسندگان
Cara A. Waller, Donald L. Jr., Joshua A. Cartmill, William A. Storer, Nan K. Huff,