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Effects of Sucrose and Trehalose on the Freezability of Markhoz Goat Spermatozoa

Khalili, B.;Farshad, Abbas;Zamiri, M.J.;Rashidi, A.;Fazeli, P.

  • Received : 2009.03.15
  • Accepted : 2009.07.01
  • Published : 2009.12.01

Abstract

The present study was conducted to observe the effect of increased osmolality of basic tris extender supplemented with trehalose and sucrose on post-thawing quality (motility, progressive motility, viability, the rate of acrosome abnormality, total abnormality and membrane integrity) of Markhoz goat spermatozoa. Fresh semen samples were evaluated for motility and sperm concentration. Only semen samples with motility more than 70% and sperm concentration higher than $3{\times}10^{9}$ sperm/ml were used for cryopreservation. In Exp. 1, trehalose (50, 75 or 100 mM) and sucrose (40, 60 or 80 mM) were added to a basic tris diluent. Based on the results of experiment 1, the goal of Exp. 2 was to investigate the combinational effects of the highest and lowest concentrations ($T_{100}+S_{80}$ or $T_{50}+S_{40}$) of trehalose and sucrose. As the control, semen was diluted and frozen in the tris diluent without trehalose or sucrose. The results in Exp. 1 showed that all evaluated spermatozoa characteristics improved significantly after freezing and thawing (p<0.05) and at the same time the increase of trehalose and sucrose concentrations in basic extenders was seen, with the best results obtained for extenders containing 70 and 100 mM trehalose and 80 mM sucrose. Comparing these results with those of control diluents, the effects of supplementation were significantly (p<0.05) better. In Exp. 2, the results showed no significant differences (p>0.05) between $T_{100}+S_{80}$ and $T_{50}+S_{40}$ extenders, but the results of $T_{50}+S_{40}$were slightly better than obtained with $T_{100}+S_{80}$ diluents. Furthermore, the results of this experiment indicated that the sperm characteristics in the isotonic control extender were significantly (p<0.05) lower than examined extenders. In conclusion, the results of this study indicated that goat sperm can tolerate hypertonic trehalose and sucrose solutions better than isotonic control diluents in the freezing period. In particular, these positive effects have been shown for acrosome integrity, which is very important for the fertilization capacity of sperm. The data indicated that addition of trehalose plus sucrose to the freezing extender can be recommended for cryopreservation of goat spermatozoa, but more data is needed on pregnancy rate, acrosome reaction and IVF to ascertain the real effect.

Keywords

Markhoz Goat;Cryopreservation;Semen;Trehalose;Sucrose

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