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Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 2008;21(12): 1721-1727.
DOI: https://doi.org/10.5713/ajas.2008.80159    Published online November 3, 2008.
Effects of Sucrose and Glycerol during the Freezing Step of Cryopreservation on the Viability of Goat Spermatozoa
A. Farshad*, S. Akhondzadeh
Correspondence:  A. Farshad,
Four experiments were conducted to study the following: i) the influence of different concentrations of sucrose (0.15, 0.3 and 0.5 M with osmolality of 308, 500 and 760 mOsm/kg, respectively) in diluents and control diluent (370 mOsm/kg) on intensity of motility and progressive motility of goat sperm without rehydration and freezing step in four incubation periods (0, 0.5, 2 and 4 h after dilution); ii) the influence of gradual dilution (in 3 steps) on improvements in ascertained results of the first experiment; iii) cryoprotective effects of different concentrations of sucrose (0.15, 0.22, 0.29 and 0.37 M with osmolality of 450, 560, 740 and 920 mOsm/kg, respectively) plus 7% glycerol and 20% egg yolk in basic diluent (Tris-Citric acid-Fructose) and iv) the effect of two concentrations of sucrose (0.15 and 0.22 M) with and without glycerol (7%). In experiment 1, we obtained better results for control diluent, 0.15 and 0.3 M sucrose supplemented diluents with 0 and 0.5 h incubation periods. In experiment 2, apart from a slight improvement, similar tendencies to experiment 1 were observed. In experiment 3, we obtained the best result for diluent with 0.22 M sucrose with regard to intensity of motility, progressive motility, live sperm and normal acrosomes (404%, 3.10.2, 374% and 374%, repectively). In experiment 4, we obtained the best result for diluent with 0.22 M sucrose plus 7% glycerol in regard to intensity of motility, progressive motility and live sperm (393%, 3.60.4 and 414%, respectively). The characteristic normal acrosomes in diluents without glycerol, i.e. diluents with 0.15 and 0.22 M sucrose showed better results (398 and 426% respectively). With regard to the release of hyaluronidase enzyme there were no significant differences between diluents (p>0.05). The results of the diluents with 0.15 and 0.22 M sucrose without glycerol were slightly lower than those with glycerol (6911 and 7011 vs. 7211 and 7011 120106 units ml-1, respectively). In conclusion, the use of concentrated sucrose solutions showed that goat sperm can tolerate osmolality up to 560 mOsm (0.22 M) in the freezing period. In addition, glycerol proved to be a necessary cryoprotective agent in the cryopreservation of goat sperm, particularly for intensity of motility, progressive motility and live sperm.
Keywords: Goat; Spermatozoa; Cryopreservation; Osmolality; Sucrose; Glycerol

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