1. Lee Index (weight (g0.33)÷ nasoanal length (mm)), density, body water and proportional weight of the gonadal fat pad were tested as estimates of body fat in a normal population of mice and a population which included obese mice.
2. In a normal population only body water and fat-pad weight correlated significantly with body fat.
3. In a population of normal and obese mice all four indices correlated significantly with body fat.
4. Lee Index had little advantage over weight: length as an estimate of body fat, and density did not correlate well enough to be used as a method of estimation.
5. Proportional weight of the gonadal fat pad is recommended as a simple reliable estimate of body fat in normal or obese mice.
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