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    The Effect of Melatonin on Sperm Quality and Testicular Size of Normospermic and Pathospermic Rams in the Anoestrous Season
    (OSTAG-WERBUNG & VERLAG, 1998) Çoyan, K; Kaya, A; Karaca, F; Ataman, M B; Yıldız, C
    The aim of this study was to investigate the effects of melatonin implants on sperm quality and testicular size of normospermic and pathospermic rams in the anoestrous season. The study was carried out on a total of fourteen Konya Merino rams. As a consequence of preliminary experiments, eight rams were found as normospermic and six rams as pathospermic. Both the normospermic and the pathospermic rams were divided into two groups with regard to spermatologic features and testicular size. Four normospermic and three pathospermic rams were treated with melatonin implant (Regulin(R)) and control groups were sham-treated. Semen samples of each ram were started to be collected after 5 weeks of the melatonin applications twice a week for 6 weeks. Semen samples were examined for volume, individual motility, sperm concentration, live/dead and abnormal sperm rates. Scrotal circumference and testes volume of the rams were measured within 15-day intervals during the study. Sperm motility and abnormal spermatozoon rates were found to be higher in the semen samples obtained from normospermic melatonin implanted rams than those of normospermic control rams. Significant variations in all spermatologic characteristics studied were found between pathospermic melatonin implanted rams and those of pathospermic control rams. Scrotal circumferences and testes volumes were found to be significantly higher in all melatonin implanted rams than in control rams. Our results indicated that melatonin implants have positive effects on sperm quality and increased the scrotal circumference and testes volume of both normospermic and pathospermic rams in anoestrous seasons.