Natural honey as a cryoprotectant to improve Arab stallion post-thawing sperm parameters

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Objective: To investigate the effect of extender supplementation with different concentrations of a honey bee on post-thawed sperm motility, viability index, membrane and acrosome integrities in Arab stallion. Methods:Five ejaculates from each of four Arabian stallions were subjected to cryopreservation with a modified INRA-82, without any supplementation (control) or supplemented with 1%, 2%, 3%, 4% and 5% honey bee. After thawing, all samples were maintained at 37 °C, while analyses were performed at 0, 1, and 2 and 3 h. Sperm motility %, viability index %, membrane integrity % and acrosome integrity % of each sample was determined by conventional laboratory methods. Results: Relative to the control group, supplementation with honey (2%, 3% and 4% significantly improved (P < 0.01 at least) post-thaw sperm motility, viability index (P < 0.001 at least) and had a positive effect on membrane integrity and intact acrosome % (P < 0.001 at least) at 0, 1, 2 and 3 h post-thawing. For all semen parameters, the lower concentration of honey (1%) and higher concentration (5%) did not show significant differences (P > 0.05) compared with the control. Conclusion: Honey bee supplementation in Arab stallion semen extenders provided a better protection of sperm parameters against cryopreservation injury, in comparison to the control groups.
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