It is important to prevent microbial contamination during liquid preservation of semen in pigs. We examined the effects of curcumin supplementation on the quality of porcine spermatozoa irradiated with ultraviolet-C (UV-C) at 228 nm. UV-C is used to disinfect gases and solid surfaces. In the first experiment, porcine semen was preserved with 0, 10, 25, 50 or 100 μM curcumin under UV-C irradiation at 228 nm for 7 days at 15°C. The irradiation did not affect the motility and viability of preserved spermatozoa but decreased the percentage of plasma membrane integrity of spermatozoa. Curcumin supplementation at 25 μM significantly improved the plasma membrane and acrosome integrity of irradiated spermatozoa compared with spermatozoa preserved without curcumin (p < .05). In the second experiment, semen was preserved with or without 25 μM curcumin with UV-C irradiation at 228 or 260 nm for 3 days at 15°C. Curcumin supplementation increased the percentages of total motility, sperm viability and plasma membrane integrity of preserved spermatozoa at both irradiation wavelengths (p < .05). All quality parameters of 260 nm irradiated spermatozoa decreased compared to those of the other groups, irrespective of curcumin supplementation. The collective findings indicate that porcine spermatozoa can retain their viability even after continuous long-duration irradiation with 228 nm UV-C. Curcumin supplementation improves the quality of UV-C irradiated spermatozoa during semen preservation.
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