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    The effect of Sildenafil (Viagra((R))) on serving capacity of rams
    (B W K P R & VERLAG, 2005) Coyan, K; Kaya, A
    Introduction The aim of this study was to investigate the effect of sildenafil administration on mating performance in the rams. Material and methods In a preliminary experiment, serving capacity of 21 Konya Merino rams was determined by pen mating test performed individually 3 times with 4 estrus ewes during a period of 1 hour. Based on the average number of mating in the preliminary experiment, 8 rams which had served 5 or less than 5 times were considered to be of low serving capacity. The other 8 rams which had served 7 and more than 7 times in an hour were considered to be of high serving capacity. In total 16 rams were selected for the further experiment. The other 5 rams which had served 6 times in the pen mating test were not considered for the further experiment. 1 hour before serving capacity evaluation, 4 rams from each group were treated intrarectally with 100 mg Sildenafil (Viagra (R)) homogenized in cocoa oil. The remaining rams from each group were treated only with cocoa oil and used as control. In addition to the total number of mating in an hour, rams were evaluated for the reaction time which is the time period between introduction and first mating. Results Sildenafil administration resulted in an increase in the total serving capacity of rams in both groups. The reaction time did not differ significantly. Conclusion Mating performance in rams is positively influenced by sildenafil. Further investigations are necessary to determine whether decreased libido could successfully be treated with this drug.