Relation between leptin and estradiol levels in Egyptian lactating Arab mares during foaling heat |
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| Authors: | Amal M. Abo El-Maaty Faten I. Gabr |
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| Affiliation: | 2. Department of Animal Science, North Dakota State University, Fargo 58105;3. Department of Physiology and Pharmacology, Texas A&M University, College Station 77843;1. Department of Biology, University of Bergen, PO Box 7803, Bergen NO-5020, Norway;2. Institute of Marine Research, Austevoll Aquaculture Research Station, Storebø NO-5392, Norway;3. Comparative and Molecular Endocrinology Group, Centre for Marine Sciences (CCMAR), University of Algarve, Campus de Gambelas, Faro 8005-139, Portugal;3. Department of Clinical Studies, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA |
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| Abstract: | Sixteen Arab lactating mares belonging to Al-Zahraa Arab Horse Stud underwent two ultrasound examinations at 3 weeks interval starting from the day of demonstration of foaling heat. In addition, daily blood samples were collected from parturition until after exhibiting first postpartum estrus (day 11) with daily observation of estrous signs. Both leptin and estradiol hormones were assayed. Mean day of foaling heat was 8.9 ± 0.9 day. Most mares came in foaling heat during days 9 and 10 had high conception rate compared to those who came in estrus earlier or later. Estradiol levels were high after day of foaling then decrease after expression of foaling heat. But leptin levels increase from day 8 to day 10 compared to other days before and after the first ovulation. A significant positive correlation was found between estradiol and leptin (r = 0.58, p < 0.025). The positive correlation between leptin and estradiol led us to suggest that leptin hormone plays an important role in ovulation of the first postpartum estrus in mares. |
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