To determine the effects of parasympathetic-influencing drugs on reproductive phenomena in bulls, four ejaculates were collected at 15-min intervals from each of six bulls beginning 30 min after a subcutaneous injection of 400 mg pilocarpine, 200 mg atropine, or physiological saline solution. Each treatment was administered twice, so that a total of 144 ejaculates was collected. Pilocarpine significantly (P<0·01) decreased the concentration of spermatozoa and increased the time required to mount, the duration of ejaculation, the volume of semen, the number of spermatozoa per ejaculate and the concentration of chloride in the semen. Atropine had the reverse effect on these characteristics and significantly (P<0·01) increased the concentration of fructose in the semen. These results demonstrate that atropine and pilocarpine, which are known to influence the parasympathetic system, alter the reaction time of the bulls, the secretion of one or more accessory sex glands, the passage of spermatozoa through the male reproductive tract, and the emission of semen during ejaculation.
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