J. Anim Sci.
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J. Anim Sci. 1974. 39:889-892.
© 1974 American Society of Animal Science
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Developmental Changes in Spermatogenesis, Testicular Carnitine Acetyltransferase Activity and Serum Testosterone in the Ram1

B. D. Schanbacher2, W. R. Gomes and N. L. VanDemark3

The Ohio State University and Ohio Agricultural Research and Development Center, Columbus 43210

Abstract

Total of 73 crossbred rams was used to determine spermatogenic and steroidogenic changes in the testis of the growing animal. Testicular weight increased slowly until 80 days of age, then increased tenfold during the following 3 months. Spermatogenesis began in rams at 60 to 70 days of age and was qualitatively complete by 120 days. Although testicular levels of the enzyme carnitine acetyltransferase (CAT) increased in growing rams, CAT did not appear to be uniquely associated with any particular cell type. Therefore, this enzyme was judged to be unsatisfactory as a cell "marker" in studying spermatogenesis in this species. Serum testosterone levels, measured by radioimmunoassay, increased during the puberal period from 0.1 ng/ml to 2.0 ng/ml, and were highly correlated with increased CAT levels (r = 0.75; P < .01).

Footnotes

1 Journal Article No. 155-73, Ohio Agricultural Research and Development Center. A contribution from the Department of Dairy Science and the Animal Reproduction Teaching and Research Center. The authors are indebted to Dr. J. K. Judy, Dr. C. F. Parker and Mr. R. F. Guenther for providing animals and assistance in sample collection and to Dr. S. A. Tillson, Alza Corp., Palo Alto, California for providing the antiserum used in this study.

2 Present Address: U.S. Meat Animal Research Center, Clay Center, Nebraska.

3 Present Address: Director of Research, NYS College of Agriculture and Life Sciences, Cornell University, Ithaca, N.Y.






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