Follicular Dynamic in Balady Goat in Upper Egypt Using Ultrasonography

Abstract

The objective is to study the Ultrasonographic appearances of the reproductive genitalia of cycling does (8 adult healthy, non-pregnant, cycling Balady does, examined daily for 6 weeks transrectal ultrasonographic examinations for two successive estrous cycles to investigate the length of cycle and as well the biometry of the ovaries, number and size of CL and follicles, size of uterus and cervix when possible). The obtained data showed that does have 3 or 4 Follicular waves. The last wave has the largest duration and the maximum follicle size (ovulatory). The characteristic features of follicular waves in does having three follicular waves denoted that the growth rates for the largest follicles of the ovulatory waves were significantly higher than first (p<0.001) and second waves (p<0.01). While, the characteristic features of follicular waves in doe having four follicular waves denoted that the growth rate of the largest follicles within each wave increased from the first to the fourth wave (0.49 to 0.85 mm/day respectively). The maximum diameter of the ovulatory follicles (7.83±0.51) were significantly larger than the maximum diameter of the largest follicles of the other waves (6.13±0.30 and 5.53±0.87 for third and first wave; P< 0.05), and with the second wave (5.33±0.40, p<0.01). It is concluded that ultrasonographic examinations can be satisfactory performed in our small size local breed of Balady goats. Moreover, 3-4 follicular waves could be estimated per single cycle. However, the number of growing follicles per each wave decreased dramatically from the beginning of the wave to its end either with the anovulatory or ovulatory follicles.