Abstract # 13350 Event # 141:

Scheduled for Friday, August 23, 2019 03:15 PM-03:30 PM: (Room 326) Oral Presentation


FACTORS IMPACTING THE SUCCESS OF MALE/MALE PAIRS OF RHESUS MACAQUES (MACACA MULATTA)

E. Whitfield1, A. Heagerty2, K. Baker3, M. Truelove1, K. Coleman2, J. Perlman1, A. Clay1 and M. Bloomsmith1
1Yerkes National Primate Research Center, 954 Gatewood Road NE, Atlanta, GA 30329, USA, 2Oregon National Primate Research Center, 3Tulane National Primate Research Center
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     Housing macaques in pairs rather than alone helps support their well-being. This benefit must be balanced against the risk of aggression, particularly for adult males, which accounts for a common hesitancy to form such pairs. The current study compiled archival data at three National Primate Research Centers to examine success rates of male/male introductions (success defined as living together for 2+ weeks), while measuring effects of subjects’ age and history of living alone. Data were collected on 2090 male pairs of rhesus macaques, with members from 1 to 23 years old. Overall, 74% of the introductions were successful, although only 36% were successful when both partners were 5+ years old. A logistic regression analysis was significant (Chi-square=230.6; df=5; p<0.001); significant predictors of introduction success consisted of age category (Wald=139.03, p<0.001) and duration of single housing after one year of age (Wald=24.39, p<0.001). The strongest effect of age was having at least one partner in the 1-3 yr range, which increased the chance of success (odds ratio = 2.507). However, having at least one partner 5+ yrs old reduced the chance of success (odds ratio=0.217), as did having one partner singly housed for 20+% of his life (odds ratio=0.363). These findings will help identify male pairs most likely to succeed and the results bolster confidence in cautiously proceeding with the introduction of adult male pairs.