Animal Reproduction and Al Department, Veterinary Division, National Research Center, Dokki, Giza 12311, Egypt.
Anim Reprod Sci. 2010 Jan;117(1-2):95-8. doi: 10.1016/j.anireprosci.2009.03.002. Epub 2009 Mar 13.
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.
16 头阿拉伯哺乳期母马属于 Al-Zahraa 阿拉伯马研究所在分娩热表现的当天开始，每 3 周进行两次超声检查。此外，从分娩开始到首次产后发情（第 11 天）每天采集血液样本，并每天观察发情迹象。同时检测瘦素和雌二醇激素。分娩热的平均天数为 8.9+/-0.9 天。大多数母马在第 9 天和第 10 天发情，与发情较早或较晚的母马相比，受孕率较高。分娩后雌二醇水平升高，分娩热表达后下降。但与第一次排卵前后的其他天数相比，瘦素水平从第 8 天到第 10 天增加。发现雌二醇和瘦素之间存在显著正相关（r=0.58，p<0.025）。瘦素和雌二醇之间的正相关使我们认为瘦素激素在母马第一次产后发情排卵中发挥重要作用。
