J. Anim Sci.
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J. Anim Sci. 1974. 39:732-736.
© 1974 American Society of Animal Science
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Reproductive Physiology of the Stallion. II. Daily Production and Output of Sperm1, 2,

M. R. Gebauer3, B. W. Pickett4 and E. E. Swierstra5

Colorado State University, Fort Collins 80521

Abstract

Daily sperm production (DSP) was estimated by quantitative histological analysis in two groups of stallions. The DSP was 7.8 billion (109) for stallions in Group I (sacrificed in June 1971) which was not significantly different from the 8.1 billion for stallions in Group II (sacrificed in July 1972). However, sperm production per gram of testicular parenchyma averaged 19.3 x 106 for stallions in Group I compared to 22.3 x 106 for stallions in Group II(P< .05).

Daily sperm output (DSO) accounted for 98% and 81% of the DSP of stallions in Groups I and II, respectively. The correlation between DSO and DSP was 0.80 (P< .01), while the correlation between DSP and testicular weight was 0.77 (P<.01).

Footnotes

1 This investigation was supported in part by grants-in-aid from American Breeders Service; Cryenco; and the National Association of Animal Breeders.

2 Portions of these data were from a thesis submitted by M. R. Gebauer to the Graduate Faculty of Colorado State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

3 Present address: Universal Semen Service, Ltd., Box 910, Cardston, Alberta, Canada.

4 Animal Reproduction Laboratory, Department of Physiology and Biophysics.

5 Visiting Scientist, Agriculture Canada, Research Station, Brandon Manitoba, Canada.






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