artificial insemination (AI) of sheep is and advantageous management practice aimed at the genetic improvement at farm level and a program of genetic selection. Furthermore AI has the potential for a significant impact on the sheep breeding industry. The main role of AI in sheep production is to increase the rate of genetic improvement and AI also contributes to achieve other goals, e.g. allowing extensive use of the best available rams, therefore increasing selection pressure and the rate of response to selection.With AI, superior rams identified more easily through progeny testing. Because progeny testing involves large numbers of animals over long periods of time, sires under test may be too old or even dead by the time their progenies have proven