Abstract # 13430 Poster # 158:

Scheduled for Friday, August 23, 2019 06:00 PM-08:00 PM: (Alumni Lounge) Poster Presentation


OBESITY, DAILY ACTIVITY, AND RESTING METABOLIC RATE IN NONREPRODUCTIVE MARMOSETS (CALLITHRIX JACCHUS)

C. N. Ross1,2, J. Adams1, M. L. Power3, R. Colman4,5 and S. D. Tardif1
1Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX 78245, USA, 2Texas A&M San Antonio, One University Way, San Antonio TX 78224, 3Conservation Ecology Center, Smithsonian Conservation Biology Institute, Washington DC 20008, 4Wisconsin National Primate Research Center, Madison WI 53715, 5Dept. of Cell & Regenerative Biology, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705
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In recent years many captive marmoset colonies in the US are reporting higher rates of diabetic symptoms, cardiovascular disease, and obesity (450g+). To date there are no established criteria to define a healthy weight or standardized nutritional requirements. In order to establish recommendations for the basic diet, the relationships between diet, weight, metabolic status and activity are being evaluated for marmosets at SNPRC. Daily activity measured via an actimeter worn on a collar for one week (n=28) ranged from 20 to 169 counts/hour with an average daily activity of 77.6 (+41.6). Activity is significantly correlated with both weight of the individual (r= -0.42, p=0.03), and fat mass (r= -0.5, p=0.007), with larger animals being significantly less active throughout the day. Resting metabolic rate was measured by placing the marmosets in a Fox Box respirometry chamber to estimate an average VO2max. While VO2 max is significantly negatively correlated with total activity (r= -0.46, p=0.03), VO2 max per gram is not significantly associated with activity. Overall obese animals (n=11) have significantly lower activity (counts/hr) than lean animals (43 vs 94), with no significant differences in VO2/gram (0.58 obese, 0.66 lean), suggesting that lean and obese animals have similar resting metabolic rates. In order to confirm these relationships it will be necessary to include marmosets from WNPRC to broadly define nutritional needs for captive marmosets.