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Puberty And Related Phenomena in Angoni (Short Horn Zebu) Bulls

National Council for Scientific Research, Zambia^,2

Abstract

A total of 28 Angoni bull calves was slaughtered between 0 and 17 months of age to determine pubertal changes in endocrine and reproductive organ characteristics. Appearance of sperm in the epididymides at 11 months (puberty) was accompained by a sudden increase in weights of testes, epididymides and seminal vesicles. Pituitary FSH and ICSH concentrations declined at 2 months, and the pituitary ICSH, pituitary ICSH:FSH ratio, and seminal vesicular fructose increased markedly at 7 to 9 months. Total gonadal and extragonadal sperm totaled 8.0 x 10⁹ and 6.4 x 10⁹, respectively, at 17 months of age.

¹ The authors are indebted to Mr. D. K. Dutta-Roy for his advice in the statistical analysis, Messrs. S. Chilinda. J. Parshotam, D. Lungu, D. Mvula, late J. Nguluwe for their able technical assistance, and to the Endocrine study Section of the NIH for the standard pituitary hormone preparations.

² Physiology Laboratory, P.O. Box 49, Chilanga, via Lusaka, Zambia.