the artificial insemination with frozen-thawed semen in ewes
artificial insemination of the sheep is an advantageous management practice aimed at the genetic improvement at farm level and a program of genetic selection.Furthermore artificial insemination has the potential for a significant impact on the sheep breeding industry.The main role of artificial insemination in sheep production is to increase the rate of genetic improvement and artificial insemination also contributes to achieve other goals, allowing extensive use of the best available rams, therefore increasing selection pressure and the rate of response to selection.With artificial insemination, superior rams can be 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 valuable.Therefore artificial insemination, by speeding up the identification of superior rams at a younger age, results in faster genetic progress.The use of Frozen semen for artificial insemination can also increase the rate of genetic progress by storing semen collected from young rams before their superiority is confirmed by progeny testing, therefore allowing the use of genetically superior semen more widely.Artificial insemination ensures good paternal control, and fertilization of groups of females by males of different genotypes is easily achieved.In addition artificial insemination takes advantage of estrous synchronization with its precise control of ovulation and parturition and furthermore allows the advantage of out of season breeding.In addition to the value of artificial insemination with frozen semen for genetic improvement, artificial insemination is associated with other animal health benefits.This technique helps avoid disease transmission and and allows the transport of semen when the risk of disease prevents ram movement, And artificial insemination reduces the risk of spreading sexually transmitted genital infections associated with natural mating.