Enhancement of Semen Cryopreservation from Native Thai Bulls Through Moringa oleifera Leaf Extract Supplementation.

Cryopreservation of native Thai bull semen often results in significant post-thaw quality reduction, underscoring the need for effective cryoprotective strategies. This study investigated the effect of Moringa oleifera leaf extract (MOLE) as an antioxidant supplementation by incorporating four MOLE concentrations (0-1.5% [w/v]) into a standard semen extender, followed by cryopreservation using liquid nitrogen vapor freezing. Data were analyzed using a randomized complete block design with Tukey's post hoc test (p < 0.05). Post-thaw analysis of semen revealed that 1 mg/mL MOLE significantly enhanced total sperm motility, progressive sperm motility, sperm viability, and sperm plasma membrane integrity compared to the control and other MOLE concentrations (p < 0.05). This concentration also improved the amplitude of lateral head displacement and curvilinear velocity and reduced malondialdehyde levels in semen samples (p < 0.05), indicating reduced lipid peroxidation. Higher MOLE concentrations negatively impacted semen quality. In conclusion, supplementation with 1 mg/mL MOLE markedly improved post-thaw semen quality and reduced lipid peroxidation, suggesting its potential as an antioxidant for enhancing reproductive outcomes in native Thai bulls.