The present study was conducted on yearling rams (n= 30) to determine the relationship between scrota1 circumference (SC) and histomorphological features of the testis and epididymis. They were selected from those slaughtered at the local abattoir and had chest girth measurements of 48 to 50 cm, but with variations in SC. Measurements of SC was determined by using a metric tape. Following clinical examination, rams were slaughtered and both testes and epididymis were excised and weighed. Specimens from the right testis and the respective epididymis were fixed and prepared for histopathological examination. The results revealed that SC was closely correlated to testes weight (r=0.975), percentage of seminiferous tubules exhibiting the presence of elongated spermatids (r=O.Y44), as well as testis score (r=0.917). A positive high correlation was also existed between testicular weight and either of percentage of tubules with elongated spermatids (r=0.959) or testis score (r=0.949). A comparatively low correlation was calculated between epididymal weight and either of SC (r=0.610), testes weight (r=0.614) , percentage of tubules with elongated spermatids (r=0.647) or testis score (r=0.620). Classification of the examined rams was based upon SC measurements, testes weight and testicular spermatogenic activity. Those ram with SC of 11.5 to 20cm and had testes weight up to 100 gm. was classified as unsatisfactory. They exhibited either testicular hypoplasia (partial or complete) or testicular atrophy on microscopic examination of the testes. Whereas, rams with SC of 24 cm or more and had testes weight of 134 gm. or more were classified as satisfactory potential breeders. They exhibited a uniform picture of normal spermatogenesis on microscopic examination of the testes. It can be concluded that the prospective herd sires may be selected from those yearling Rahmani rams with chest girth measurements of 48 to 50 cm and had SC of 24 cm or more. Selected rams should be subjected for semen analysis before being proved. |
