Some Parameters of Stallion Semen Ejaculates During Different Seasons

Abstract

The aim of the present study was to characterize the effect of season on some parameters of native Egyptian stallion semen ejaculates. Semen was collected from six mature healthy stallions once per season. The parameters of evaluation include macroscopical (volume, color and consistency) and microscopical examination (motility, live %, SCC, sperm morphology and abnormalities) of stallion semen characters. Results revealed that the gel free volume, total sperm per ejaculate, normal sperm morphology and longevity of stallion semen at room temperature 20-25℃ in non-breeding season and 32-38℃ in breeding season and at 38℃ were significantly higher (P<0.01) in breeding season than in non-breeding season while abnormal sperm percentage was significantly higher (P<0.01) in non-breeding season than in breeding season. Furthermore, the gel portion of the ejaculate, live sperm percentage, motility of sperm and sperm cell concentration were not showed any significant difference between breeding season and non-breeding season. Conclusion, the season has a direct significant effect on the volume of ejaculate, total sperm per ejaculate, normal sperm percentage and abnormal sperm percentage.