Effects of age, lactation, and repeated cycles on rhesus monkey copulatory intervals

American Journal of Primatology
M E WilsonThomas P Gordon

Abstract

Young, sexually mature female rhesus monkeys copulate on more days prior to conception than do older females, and this prolonged discrete mating period is associated with an earlier rise in serum estradiol prior to the first ovulation of the breeding season. The influence of repeated ovulatory cycles and the presence of a suckling infant on the copulatory patterns were examined in two separate analyses. Extending previous work, young, nulliparous females copulated on more days at the first ovulation of the breeding season than did older, multiparous females. However, the duration of the copulatory period at the second ovulation of the breeding season was similar and significantly shorter for both age groups. Furthermore, the presence of a suckling infant did not influence the duration of the mating periods in adult, multiparous females. The onset of copulatory behavior for all females was associated with serum estradiol concentrations of approximately 90 pg/ml, indicating that the age and cycle differences in the duration of the copulatory periods are due to the time course of serum estradiol prior to ovulation. A separate, longitudinal analysis of the duration of the mating period associated with the first ovulation of three s...Continue Reading

References

Nov 1, 1983·Biology of Reproduction·M L WalkerM E Wilson
Sep 1, 1981·Biology of Reproduction·E SchallenbergerE Knobil
Nov 1, 1980·Developmental Psychobiology·M E Wilson, T P Gordon

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Citations

Jun 25, 2004·Journal of Sex Research·Kim Wallen, Julia L Zehr

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