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  • Title: Progesterone as a predictor of cyclicity in Bolivian squirrel monkeys during the breeding season.
    Author: Aksel S, Diamond EJ, Hazelton J, Wiebe RH, Abee CR.
    Journal: Lab Anim Sci; 1985 Feb; 35(1):54-7. PubMed ID: 4039012.
    Abstract:
    In a squirrel monkey breeding colony, two distinct groups of females were observed during the breeding season, December through March. One had low and the other had high estradiol (E2) and progesterone (P) concentrations. The conception rate in females with high E2 and P values was 74%. However, only 25% of monkeys with low steroid concentrations became pregnant during the breeding season. This study showed that all mature females in a colony may not be cycling concurrently and that two serum P measurements obtained at four-day intervals may be utilized to detect noncycling monkeys during the breeding season.
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