Prepuce and Urethral Process as Indicators of Puberty in Goat and Sheep
Penile development, represented by prepuce and urethral process was studied using ten Awassi ram lambs, ten Shami and ten Baladi goat kids. Results showed that during the second phase of prepubertal period (5-6 months), the mean daily weight gain for Awassi was 40.33 g. compared to 187.33 g. during the first phase (3.5-5 months). This decrease in body weight gain coincided with a rapid increase in testes volume (42.86 ml.) and the start of penile development. Prepucial development started in 43% of the 1ambs at a mean age of 21.33 weeks and at a mean testes volume of 127 ml. This development preceded that of the urethral process by three weeks at a mean testes volume of 155.72 ml. and coincided with the second phase of prepubertal period. Scores of prepuce and urethral process were, very close, 2 and 1.86, respectively, by the end of prepubertal period. In contrast, penile development in Shami and Baladi goat started at a mean age of 16 weeks with a testes volume of 79.2 and 132 ml., respectively. In addition 66.6% and 71.4% of Shami and Baladi breeds had a urethral process score of five, at this spec ific age. Four weeks later (20 weeks of age) all Shami and Baladi goats had a urethral process score of five. Furthermore, all Baladi goats had a prepuce score of five compared to only 33.3% of the Shami. Awassi attained puberty at a mean age of 30.6+2.1 weeks compared to 20.29 +1.38 and 24.3 +3.8 weeks for Balad i and Shami goat, respectively. At puberty, Awass i sheep had a mean prepuce and urethral process scores of 3.7 +0.49 and 4.7 +0.49, respectively, while both scores for Baladi and Shami were five. At these scores, Awassi ram 1ambs are considered puberty even though their penis did not reach maximum development, whereas goats penile development attains maximum scores before puberty.