1. Ala-ud-Din, N.A. and I.A. Osama 1985. A comparative study of the effects of diluents and thawing temperature on rate of motility and livability of spermatozoa stored at 4 celsius. Pakistán Vet. J. 5(3):116-119.
2. Ansari, M.R. 1988. Freezability of bovine spermatozoa in Laiciphos-478 employing "Tupol" technique. Indian Journal of Animal Production. 9(1):13- 15.
3. Evans, G. and W.M.C. Maxwell. 1987. Salomon ́s Artificial Insemination of sheep and goats. Butterworths Australia.
4. First, N.L., H.A. Henneman, W.T. Magee, and J.A. William. 1961. The frozen storage of ram semen. J. Reprod. Fertil. 20:74-78.
5. Holy, L. 1983. Bases biológicas de la Reproducción bovina. Ed. Diana México. p.463.