J. Anim Sci.
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J. Anim Sci. 1974. 38:117-120.
© 1974 American Society of Animal Science
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Testicular Function in Bulls 10 Weeks after Unilateral Vasectomy1

Harold D. Hafs, Wayne D. Oxender, Patricia A. Noden and Rupert P. Amann

Michigan State University2, East Lansing 48824 and The Pennsylvania State University,3, University Park 16802

Abstract

Five mature dairy bulls were killed 10 weeks after unilateral vasectomy. Testes on the vasectomized side weighed 67% of the contralateral controls (P<.01) and contained only 34% as many spermatids as the control testes (P<.01). Since a previous report showed little or no change in spermatogenesis in younger bulls at 23 weeks after vasectomy, possibly vasectomy temporarily interrupts spermatogenesis in bulls. In the caput-corpus epididymidis and in the cauda epididymidis on the occluded side, sperm numbers were 20% (P<.01) and 49% (P<.01) of those in the control side.

Footnotes

1 Published with the approval of the Director of the Agricultural Experiment Station as paper No. 6352. Select Sires, Inc. provided the bulls for this experiment.

2 Department of Dairy Science.

3 Dairy Breeding Research Center.






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Copyright © 1974 by the American Society of Animal Science.