The Breed and Season Effects on Scrotal Circumference and Semen Characteristics of Hair Sheep Rams Under Tropical Conditions


Author’s address (for correspondence): Ricardo Aké-López, Universidad Autonoma de Yucatan, Km 15.5 carretera Merida-Xmatkuil s/n, codigo postal 97315, 9992-3200, Merida, Yucatan, Mexico. E-mail:


The aim of the present work was to evaluate the breed and season effects on scrotal circumference (SC) and semen characteristics of 28 mature hair sheep rams kept under tropical conditions. SCs, sperm concentration (SPC) and abnormal sperm were significantly affected by breed effect (p < 0.001). The season effect was significant in SPC (p < 0.0001) while ejaculate volume, mass motility and SPC were affected by breed × season interaction effect (p < 0.001). It can be concluded that the magnitude of the breed and season effects were not sufficient to affect the reproductive capacity of hair sheep rams throughout the year.