Abstract # 13353 Event # 132:

Scheduled for Friday, August 23, 2019 03:15 PM-03:30 PM: (Room 325) Oral Presentation


R. Beck, G. Lubach and C. Coe
University of Wisconsin-Madison, Harlow Primate Laboratory, 22 N. Charter Street, Madison, WI 53715, USA
     Rhesus monkeys are typically seasonal breeders, but can be induced to extend the timing of their mating and births under captive conditions. The following analyses evaluated the potential impact of extending their pregnancies and deliveries year-round. Birth records from a large breeding colony housed in an indoor facility were analyzed across 25 years to examine seasonal trends in monkeys that mated in one of two ways: spontaneous in social groups or with a scheduled, timed-mating protocol. The dates of delivery and birth weights for 2084 infants were used in these analyses. Younger nulliparous females mating in social groups evinced a clear seasonal peak when birthing their first infant. However, older primiparous and multiparous females could be bred continuously, which resulted in similar numbers of infants being born in every month of the year. Based on the pregnancy success rates, infant birth weights, and the normal sex ratio of infants birthed year round, there were no adverse effects of breeding rhesus monkeys in this way. The continuous availability of infant births can be very advantageous for many types of research programs.