J. Anim Sci.
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J. Anim Sci. 1972. 34:302-309.
© 1972 American Society of Animal Science
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The Male Rabbit. VI. Effects of Ejaculation and Season on Testicular Size and Function1

W. S. Carson and R. P. Amann

The Pennsylvania State University2, University Park 16802

Abstract

QUANTITATIVE studies of testicular histology for bulls, rams and rabbits ejaculated less frequently than once daily were summarized by Amann (1970). He concluded that there was no evidence to support the concept that ejaculation altered the rate of sperm production. However, frequently copulating male rats were found to have heavier accessory reproductive organs than sexually rested males (Drori and Folman, 1964; Folman and Drori, 1966; Herz, Folman and Drori, 1969) although testicular weight was not significantly different. Lambiase and Amann (1969) found no significant differences in paired testicular weight for rabbits collected twice every other day as compared to sexually rested rabbits. Nevertheless, it is possible that the frequency of ejaculation or the duration of treatment in their experiments was insufficient to elicit testicular responses. Amann (unpublished) found the mean paired testicular weight for 27 rabbits ejaculated once daily for 11 to 21 days was heavier (P <.05) than that for sexually rested litter-mates (6.65 vs. 5.17 g).

Footnotes

1 Authorized for publication on 6-16-71 as Paper No. 4001 in the journal series of the Pennsylvania Agricultural Experiment Station. This investigation was supported by Research Grant HD-01356-06 from the National Institute of Child Health and Human Development. The authors are indebted to F. M. Abel, G. J. Killian and J. T. Lambiase, Jr. for technical assistance and to Dr. G. L. Hargrove for aid in the statistical analyses.

2 Dairy Breeding Research Center, Department of Dairy Science.






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