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Influences of season and age on maturation in vitro of rhesus monkey oocytes

Summary. Oocytes obtained from antral follicles of adult and adolescent rhesus monkeys during the annual breeding season extruded polar bodies in vitro at significantly higher rates (50–60%) than oocytes from animals of similar age during the non-breeding season (20–30%) or from infant and prepubertal females at any time of the year (20–30%). The proportion of oocytes degenerating in culture was greatest in groups where maturation was highest.

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