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Abstract
Equex STM paste, a water-soluble detergent, exerts the protective effect of egg-yolk during sperm cryopreservation. This study aims to evaluate the post-thaw quality of rhesus monkeys' epididymal spermatozoa in the Tris-citric-glucose egg-yolk extender, supplemented with or without Equex STM paste (0.5%, v/v) (n=6). Sperm motility, progressive motility, motion characteristics, viability, acrosome integrity and mitochondrial activity were compared immediately post-thaw. Equex STM paste supplementation significantly improved sperm motility (35.0±4.5 vs. 23.7±5.0%), progressive motility (15.4±2.1 vs. 9.8±2.7%) and percentage of sperm with intact acrosome (30.4±4.5 vs. 26.3±4.6%) compared to the controls, respectively. This is the first report applying Equex STM paste for monkey epididymal sperm cryopreservation and is expected to be beneficial as a model for endangered non-human primates.
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