Abstract
The effects of age and restricted daily feeding on dietary self-selection were examined as these variables are already known to affect feeding behaviour, protein requirements and central neurotransmitter metabolism. Absolute levels of energy and protein intake, or the ratio of protein to total energy consumed, did not differ between adult and weanling free-feeding rats. A daily 16-h food restriction schedule increased energy intake and body weight gain in adult rats but decreased these parameters in weanlings. However, food restriction significantly decreased protein intake and the ratio of protein to total energy consumed in both adult and weanling rats. These results show that these variables can interact to alter dietary self-selection and have implications for work using drugs under deprived or free-feeding conditions.
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