Tribulus terrestris extract was added to the forage of 8 rams of Pleven Blackhead and Abaci breed once daily in dose l,5g per head for a period of 40 days. Semen parameters and sexual behavior during semen collection were evaluated. It was found that Tribulus terrestris extract improves semen quality of rams: the count of spermatozoids, time of viability and motility of sperms increase. The great number of born lambs after the use of treated rams for insemination confirms high fertility of their semen. All experimental rams manifested a good libido and active sexual behavior.
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Kistanova et al. (2005) studied this question.
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