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This study was aimed to optimize the spermatozoa cryopreservation protocol in Albino pangasius catfish by assessing the effectiveness of different cryoprotectant concentrations and different time of equilibration. The first experiment was conducted to optimize the combination of 10% methanol with different concentration of skim milk (0%, 5%, 10%, 15%, and 20%). The second experiment was aimed to optimize different equilibration time (10, 20, and 30 minutes). Deep freezer was used for the cryopreservation with a temperature of -80 °C at a storage period of 8 days. The first study found that the viability and motility of sperm after cryopreservation was significantly different (P&lt;0.05) with fresh sperm. The best result was obtained at the 10% skim milk concentration with sperm viability of 78 ± 4.35% and motility of 69.66 ± 1.52%. The second experiment identified a significant different (P&lt;0.05) in sperm viability and motility between fresh sperm and sperm post equilibration. The best result was obtained at 10 minutes equilibration time with sperm viability of 76 ± 1.15% and motility of 66 ± 2.64%. The study concluded that the 10% methanol with 10% skim milk, and 10 minutes equilibration time is the best combination for cryopreservation of Albino pangasius catfish spermatozoa.

iop conference series. earth and environmental science

Optimization of spermatozoa cryopreservation of Albino pangasius catfish: cryoprotectants with various concentrations and different equilibration times