Gestation length in rhesus macaques (Macaca mulatta)

Joan Silk, Jenny Short, Jeffrey A Roberts, Jill Kusnitz

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)95-104
Number of pages10
JournalInternational Journal of Primatology
Issue number1
StatePublished - Feb 1993


  • birth weight
  • gestation length
  • Macaca mulatta
  • pregnancy

ASJC Scopus subject areas

  • Animal Science and Zoology


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