Abstract

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.

Highlights

  • Donkeys (Equus asinus) are enjoying increased popularity as working livestock in Egypt

  • The day of follicular deviation of the Dominant follicle (DF) was recorded on D 0.80 ± 0.84 with growth rate of DF was 2.32 ± 0.18 mm d−1 and maximum diameter of 36.13 5.72 mm at D 17.60 11.14 (Figure 2)

  • The day of follicular deviation of the dominant follicle (DF), its growth rate, maximum diameter, day of maximum diameter deviation day were similar to findings of previous studies for native Egyptian Jennies [26], but greater values were reported for mammoth

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Summary

Introduction

Donkeys (Equus asinus) are enjoying increased popularity as working livestock in Egypt. The farmers still depend on this animal in carrying weights, drag small cars, and other field works. In comparison to the mare, few studies have been reported regarding the estrous cycle of the jennet. The reproductive parameters such as follicular wave patterns [1], multiple ovulations, the size of ovulatory follicle, ovarian responses to exogenous gonadotropin stimulation [2, 3], the incidence of diestrus ovulation [4], the pattern of antral formation [5], and some other physiologic characteristics related to reproductive system in mare were studied [6,7,8,9].

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