earticle

영어

This study was conducted to investigate the survival rate of frozen-thawed spermatozoa in equine by glycerol concentration and freezing speed. Two stallions (1 Thoroughbred-13 year old and 1 Arab-7 year old) bred in Korea Racing authority was examined for 1 times in a couple of weeks. Semen was collected by condom method standing heated mare and were centrifuged 650 g for 15 min. and isolated the seminal plasma. Thick fraction of semen was diluted EDTA-Lactose-egg yolk diluents to 1:1 and contained in 0.5 ml straw as 6～14×107cells/ml. Final concentrations of glycerol were 3, 5 and 7% in cryopreseved diluents and added 4 times for 2 hours equilibration. For the freezing, equilibrated straws were located 3 or 5 cm above LN2 gas for 5 or 10 min. Survival rates of pre-frozen sperm were 65.0±13.2%, 68.3±10.4%, 66.7±11.5% and post-frozen were 53.3±23.1%, 45.0±15.0%, 50.0±18.0% in 3, 5, 7% glycerol concentration, respectively. There was no difference between glycerol concentrations. Survival rates of frozen-thawed sperm on freezing speed were 36.7±10.4%, 40.0±7.1%, 30.0±13.2% at 3 cm－5 min and 33.3±11.5%, 31.7± 2.9%, 21.7±10.4% at 3 cm－10 min in 3, 5, 7% glycerol concentration, respectively. Survival rates of frozen-thawed sperm on freezing speed were 43.3±15.3%, 32.0±17.9%, 22.3±15.7% at 5cm－5 min and were 47.5±15.0%, 43.3±12.6%, 48.3±15.3% at 5cm－10 min in 3, 5, 7% glycerol concentration, respectively. There were significantly different between groups (p<0.05). These results suggest that glycerol concentration did not affect cryopreservation of stallion semen within 3～7% but freezing speed affects. In our experiment, the best cryopreservation condition was at 5 cm above LN2 gas for 10 min for pre-freezing and 7% of glycerol concentration. These results lead to commercial AI with frozen-thawed stallion semen.