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This study used two ejaculates collected from 8 rams of BCP and SCP breed in the breeding season.After microscopic evaluation,a morphological smear was performed and semen was diluted in extender TRILADYL(R) to a final concentration of 8 x 109/ml spermatozoa.After two-hour of equilibration at a temperature of 4℃,semen was frozen in nitrogen vapor (-120℃) then after 10 minutes was put into liquid nitrogen.