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

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Abstract
Oocytes obtained from antral follicles of adult and adolescent rhesus monkeys [Macaca mulatta] 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.