Cats show repeated copulation, but changes in semen qualities and quantities with repetition of ejaculation have not previously been clarified. We collected semen 4 times consecutively from 5 cats using the artificial vagina method and observed the semen qualities and quantities. No significant changes were noted in the semen volume, frequency of abnormal sperm or incidence of immature sperm, but the number of sperm and sperm motility and viability decreased with repetition, and in particular, the number of sperm in the first semen accounted for 55.0% of the total number in the 4 consecutive ejaculations, showing a significant difference from those in the 2nd-4th semen (P<0.01).
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