The hereditarily obese rat "fatty", with food intake restricted to approximately normal, laid down excessive fat at the rate of 0.56 g rat per day for up to 74 days on experiment, producing an energy denser, but lighter weight, carcass than the normal control. The "fatty" retained over 20% of the energy supplied, in its carcass, the control less than 10%.
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L. M. Zucker (1975) studied this question.