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Theoretically, FR and ad libitum animals reach the same fraction of adult mass at the same age. (a) FR starts on day 2 of age; (b) FR starts on day 42 of age. Dotted lines, 90% of adult body mass; dashed lines, 70% of adult body mass; black line, ad libitum fed; blue line, 80% FR; red line, 60% FR.
