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Journal of Dairy Science Vol. 45 No. 6 788-793
© 1962 by American Dairy Science Association ®
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Sperm Output of Dairy Bulls with Varying Degrees of Sexual Preparation1

H. D. Hafs, R. C. Knisely and C. Desjardins

Department of Dairy, Michigan State University, East Lansing

ABSTRACT

The sperm output value of false mounting relative to other sexual preparation stimuli was assessed by ejaculating 151 mature dairy bulls weekly for ten consecutive weeks after imposition of zero, one, two, or three false mounts during a planned duration of 0, 5, or 10 min of active sexual preparation.

The average values for motile sperm per ejaculate obtained from the bulls with a planned duration of 0 min were 4.95, 8.35, 10.12, and 9.84 billion for zero, one, two, and three false mounts, respectively. The comparable averages for the bulls with a planned duration of 5 min were 10.22, 10.14, 10.99, and 12.66, respectively; and for the bulls with a planned duration of 10 min were 11.61, 12.35, 10.94, and 14.31, respectively.

The averages of 8.32, 11.00, and 12.30 billion motile sperm for 0, 5, and 10 min of preparation, respectively, differed significantly (P < .01). Similarly, the averages of 8.93, 10.28, 10.68, and 12.27 billion motile sperm for zero, one, two, and three false mounts, respectively, differed significantly (P < .01). This result is primarily a factor of volume of semen per ejaculate, which was significantly (P {cong} .02) affected by the number of false mounts; whereas, the concentration of sperm was not (P {cong} .29).

The evidence supports the contention that the various sexual preparation stimuli are additive and that they conform to Fechner's Law.

FOOTNOTES

1 Journal Article No. 2951 from the Michigan Agricultural Experiment Station.






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