Derar R I, Hussein H A
Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, 71526 Assiut, Egypt.
Vet Med Int. 2011;2011:860518. doi: 10.4061/2011/860518. Epub 2011 May 10.
The objective of the current study was to describe follicular dynamics in Egyptian Jennies throughout the estrous cycle. In this experiment, 8 estrus cycles in 8 cyclic Jennies were studied from February to June using ultrasonography. The result revealed that one follicular wave per cycle was recorded throughout the studied period. Dominant follicle (DF) was firstly detected at -0.80 ± 0.84 day in Jennies. The growth rate of DF was 2.32 ± 0.18 mm/day. Left ovulations were nonsignificantly (P = .07) more than right ovulations (55.6% versus 44.6%). The CL was firstly detected at D 2.58 ± 1.2, developed in a rate of 1.19 ± 0.07 mm/day, reached a maximum diameter of 30.77 ± 1.28 mm at D 13.0 ± 0.70, and started to regress on D 17.05 ± 0.64 with a mean regression rate of 1.75 ± 0.17 mm d(-1). Results of the present study indicated that Jennies had one follicular wave per cycle. The Day of the cycle has a significant effect on the number of different classes of the ovarian follicles, but not large ones. Ultrasonographic characteristics of the preovulatory follicles could be useful to predict ovulation. CL developed and regressed in a slow rate.
本研究的目的是描述埃及母驴在整个发情周期中的卵泡动态。在本实验中，于2月至6月使用超声检查法对8头处于发情周期的母驴的8个发情周期进行了研究。结果显示，在整个研究期间，每个周期记录到一个卵泡波。在母驴中，优势卵泡（DF）最早在-0.80±0.84天被检测到。优势卵泡的生长速率为2.32±0.18毫米/天。左侧排卵比右侧排卵略多（55.6%对44.6%），但差异不显著（P = 0.07）。黄体最早在第2.58±1.2天被检测到，以1.19±0.07毫米/天的速率发育，在第13.0±0.70天达到最大直径30.77±1.28毫米，并在第17.05±0.64天开始退化，平均退化速率为1.75±0.17毫米/天。本研究结果表明，母驴每个周期有一个卵泡波。发情周期的天数对卵巢卵泡不同类别的数量有显著影响，但对大卵泡影响不大。排卵前卵泡的超声特征可能有助于预测排卵。黄体发育和退化的速率较慢。
