title: Maternal age, parity, and reproductive outcome in captive chimpanzees (Pan troglodytes).
abstract: As early as the 1970s, it was suggested that nonhuman primates may serve as models of human reproductive senescence. In the present study, the reproductive outcomes of 1,255 pregnancies in captive chimpanzees (Pan troglodytes) were examined in relation to parity and its covariate, maternal age. The results show that the percentage of positive pregnancy outcomes was negatively correlated with increasing parity. In addition, spontaneous abortions, stillbirths, and caesarian sections (C-sections) were positively correlated with increasing parity. Maternal age, rather than parity, was found to be the most important predictor of negative birth outcome. This study supports research demonstrating reproductive decline and termination in nonhuman primates, and is the first to quantitatively account for this phenomenon in captive female chimpanzees.
authors.affiliation: Division of Psychobiology, Yerkes National Primate Research Center, Atlanta, Georgia 30322, USA.
authors.forename: Katherine A
authors.initials: KA
authors.lastname: Roof
authors.forename: William D
authors.initials: WD
authors.lastname: Hopkins
authors.forename: M Kay
authors.initials: MK
authors.lastname: Izard
authors.forename: Michelle
authors.initials: M
authors.lastname: Hook
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Schapiro
mesh_terms: D000034:Abortion, Veterinary; D000818:Animals; D002585:Cesarean Section; D005260:Female; D006799:Housing, Animal; D008423:Maternal Age; D002679:Pan troglodytes / Q000502:physiology*; D010298:Parity / Q000502:physiology*; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000662:veterinary*; D050497:Stillbirth