International Journal of Primatology

, Volume 14, Issue 1, pp 95–104 | Cite as

Gestation length in rhesus macaques (Macaca mulatta)

  • Joan Silk
  • Jenny Short
  • Jeffrey Roberts
  • Jill Kusnitz
Article

Abstract

We describe some of the sources of variation in gestation length among rhesus macaques. the data were obtained from the timed-mating breeding program at the California Regional Primate Research Center (CRPRC). Information about approximately 700 pregnancies that resulted in spontaneous vaginal deliveries of liveborn young is presented. The average length of these pregnancies was 166.5 days. In this population, older females with higher parities had significantly longer pregnancies and significantly heavier infants than other females did. Other factors, including infant sex, month of conception, maternal reproductive history, and paternal identity, had no consistent effect upon gestation length.

Key Words

Macaca mulatta gestation length pregnancy birth weight 

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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • Joan Silk
    • 1
    • 2
  • Jenny Short
    • 2
  • Jeffrey Roberts
    • 2
  • Jill Kusnitz
    • 3
  1. 1.Department of AnthropologyUniversity of CaliforniaLos Angeles
  2. 2.California Regional Primate Research CenterUniversity of CaliforniaDavis
  3. 3.Neuropsychiatric InstituteUniversity of CaliforniaLos Angeles

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