References
- MIXNER, J. P. 1959. Anatomical and physiological factors affecting fertility in domestic animals. In Reproduction in domestic animals, 2, ed. H. H. Cole & P. T. Cupps. New York: Academic Press.
- NALBANDOV, A. V. 1964. Reproductive physiology, 2nd ed. San Francisco: W. H. Freeman & Co.
- ROBERTS, S. J. 1958. Infertility in male animals. In Veterinary obstetrics and genital diseases. Michigan: Edwards Brothers Inc.
- SISSON, S. &GROSSMAN, J. D. 1953. The anatomy of the domestic animals, 4th ed., revised. Philadelphia: W. B. Saunders Company.
- SMITH, H. A. & JONES, T. C. 1966. The genital system. In Veterinary pathology, 3rd ed. Philadelphia: Lea Febiger.
- SMUTS, G. L. 1974. Growth, reproduction and population characteristics of Burchell's zebra (Equus burchelli antiquorum, H. Smith, 1841) in the Kruger National Park. D.Sc. Dissertation, Univ. of Pretoria.
- SMUTS, G. L. 1975. Reproduction in the zebra stallion (Equus burchelli antiquorum) from the Kruger National Park. Zool. afr. 11:207–220.