References
- Cupps, P. T., Anderson, L. L. and Cole, H. H. (1969). The oestrous cycle, in “Reproduction in Domestic Animals” 2nd eds. by H. H. Cole and P. T. Cupps, Academic Press, New York and London.
- Frandson, R. D. (1965). Anatomy and Physiology in Farm Animals. Lea and Febiger, Philadelphia.
- Hafez, E. S. E. (1968). Reproduction in Farm Animals. 2nd eds. Lea and Febiger, Philadelphia.
- Hutchinson, J. S. M. and Robertson, H. A. (1966). The growth of the Follicles and corpus luteum in the ovary of sheep. Res. Vet. Sci. 7, 17–24.
- Orji, B. I. (1976). Studies on the biology of reproduction of the Nigerian Dwarf Sheep. Ph.D. Thesis, University of Ibadan, Nigeria.
- Steinbach, J. and Smidt, D. (1970). Cyclical phenomena in the female genital of swine: Histological observations. J. Anim. Sci. 30, 573–577.