2.4. Effectiveness of concentrated extenders for cryopreservation of rainbow trout spermatozoa
Three extenders were prepared (Ciereszko et al., 2013): 0.2 M glucose and 10% methanol, 0.3 M glucose and 15% methanol and 0.6 M glucose and 30% methanol. These extenders were used at semen-to-extender dilution ratios of 1:3, 1:1, and 3:1, respectively. Therefore, the final concentration of glucose and methanol in all variants was the same: 0.15 M and 7.5%, respectively. The aforementioned final concentrations were used in all of the subsequent experiments. Sperm motility was measured for fresh, diluted, and frozen-thawed semen (n = 3, each of diluted-fresh and frozen-thawed samples from different males) ( Fig. 2).
2.4. Effectiveness of concentrated extenders for cryopreservation of rainbow trout spermatozoaThree extenders were prepared (Ciereszko et al., 2013): 0.2 M glucose and 10% methanol, 0.3 M glucose and 15% methanol and 0.6 M glucose and 30% methanol. These extenders were used at semen-to-extender dilution ratios of 1:3, 1:1, and 3:1, respectively. Therefore, the final concentration of glucose and methanol in all variants was the same: 0.15 M and 7.5%, respectively. The aforementioned final concentrations were used in all of the subsequent experiments. Sperm motility was measured for fresh, diluted, and frozen-thawed semen (n = 3, each of diluted-fresh and frozen-thawed samples from different males) ( Fig. 2).
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