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The current study was carried out to investigate the protective effects of royal jelly supplementation on sperm motility, viability and pH value during the liquid storage of boar semen at 16 degrees C and 4 degrees C, at various periods of time (0, 24, 48, 72 and 96 h). Semen samples were collected from 11 boars, diluted with a long-term extender and supplemented with different concentration of royal jelly (0%, 0.5%, 1% and 2%) at a final concentration of 50 x 10(6) sperm/ml. In the laboratory, the semen was assessed for sperm morphology, viability (eosin-nigrosin staining), subjective motility and objective sperm motility by sperm class analyzer. In total, 396 tests for sperm viability and motility were performed. The longer storage time and the lower incubation temperature showed lower sperm motility and viability results. The results showed that royal jelly supplementation at 1% concentrations protected the functionality of the sperm plasma membrane during the liquid storage time of 96 h at 16 degrees C. Sperm subjective and objective motility results in samples stored at 4 degrees C decreased with higher royal jelly concentrations and longer storage time, and differ significantly from the results in samples stored at 16 degrees C (P < 0.05). Our data showed that royal jelly supplementation at lower concentrations can improve boar semen motility and viability parameters during liquid storage at 16 degrees C for 96 h.

The effect of royal jelly on boar sperm viability and motility during liquid storage for 96 hours