It was investigated the protective role of mediums for cryopreservation of ram semen from Black-head Pleven breed and Karakachanian breed. The positive influence of LDL- faction extracted from egg yolk, added to the medium for cryopreservation. Triladil (Minitub) over the sperm motility and viability was established. The differences between the spermatozoa cryoresistence of the two breeds were proven. [BG].
Investigation of protective role of low dencity lipoprotein fraction (LDL) over the cryotolerance of ram spermatozoa