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Comparison of C57BL/6 and DBA/2 mice in food motivation and satiety. | LitMetric

Comparison of C57BL/6 and DBA/2 mice in food motivation and satiety.

Physiol Behav

Department of Psychology, University of Florida, Gainesville, FL 32611-2250, USA.

Published: April 2010

AI Article Synopsis

Article Abstract

Demand functions describe the relationship between the consumption of a commodity and its mean or unit price. In the first experiment, we analyzed food demand in two strains of mice (C57BL/6 and DBA/2) that differ on several behavioral dimensions, but have not been examined extensively for differences in feeding and meal patterns. Mice worked for food pellets in a continuous access closed economy in which total intake and meal patterns could be measured. A series of fixed (FUP), variable (VUP), and progressive (PUP) unit price schedules were imposed. Under all schedules, DBA/2 mice consumed significantly more food than C57BL/6, a difference that was not attributable to disparity in body weight or weight gain. The higher intake of DBA/2 mice was due predominantly to larger meal size compared with C57BL/6, with no strain difference in meal frequency. In a second experiment, strain differences in meal size were not found to correlate with anorectic sensitivity to cholecystokinin (CCK) administration, or with c-Fos expression induced by CCK in PVN, AP and NTS. Thus, DBA/2 mice were motivated to sustain a higher daily food intake and meal size than C57BL/6 under the range of demand costs employed in the present work, but this strain difference is unlikely to be due to CCK action or responsiveness.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2840189PMC
http://dx.doi.org/10.1016/j.physbeh.2010.02.001DOI Listing

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