Abstract
Female rats on a free diet hoard food at relatively high rates. They differ from males in which hoarding depends on a hypothalamic mechanism active only during nutritional depletion. This anomalous hoarding by undeprived females was found to be strongly associated with the phase of the oestrus cycle. Like nestbuilding, but unlike reproductive and locomotor activities, it occurred maximally during dioestrus. Where a choice was available, undeprived females hoarded a much greater proportion of nesting material (dental swabs) than was hoarded by food-deprived male and female control groups, but food pellets continued to predominate. Thus modified or displaced nest-building activity appears to contribute to, but cannot fully account for the anomalous hoarding of food by undeprived females.
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