Abstract # 13399 Poster # 148:

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


MAINTENANCE ENERGY REQUIREMENTS OF ADULT NON-REPRODUCTIVE COMMON MARMOSETS (CALLITHRIX JACCHUS)

J. Adams1, C. N. Ross1,5, S. D. Tardif1, R. Colman2,3 and M. L. Power4
1Southwest National Primate Research Center, San Antonio, TX 78245, USA, 2Wisconsin National Primate Research Center, 3University of Wisconsin, 4Smithsonian Conservation Biology Institute, 5Texas A&M University - San Antonio
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The National Research Council (NRC) recommendation for the maintenance energy requirement (kcal/day) of captive non-human primates is twice the estimated metabolic rate or 140 X (body weight)0.75. There is concern that this recommendation is an overestimate of the energy requirement for the common marmoset due to rampant obesity in marmoset colonies and the fact that marmosets reduce metabolic rate significantly during sleep. We present data on daytime resting metabolic rate (RMR) and daily digestible energy intake (DEI) for 22 adult common marmosets of both sexes and body weights ranging from 322g to 618g. RMR was measured using open circuit respirometry with animals in a temperature controlled chamber set at 30°C, which is within the marmoset thermal neutral zone. DEI was the average of two four-day digestion trails in which food intake and fecal output was measured and gross energy quantified with bomb calorimetry. DEI equals energy intake minus fecal energy loss. Mean body weight was 435±16g; mean RMR = 31.3±1.3kcal/day; and mean DEI = 52.5±2.4kcal/day. The mean value for RMR was 83.5% of the NRC estimated RMR value for 435g primates (37.5kcal/day). Mean DEI was 1.7 times measured RMR and only 70% of the NRC recommended value for 435g primates (75kcal/day). We suggest that the equation 100 X (body weight)0.75 provides a better target for daily maintenance energy intake for adult non-reproductive captive marmosets.