Abstract
Thirty-six female rats were placed on food deprivation schedules to reduce them to 4 groups having 100, 90, 80, or 75% of prestarvation body weights. Vaginal smears were made to establish estrus cycling for 12 days before and 12 days during starvation. Lordosis responses to cervical probing were recorded for 4 days before starvation, 4 days during starvation and also 1 day during starvation after priming with estrogen. Though starvation did not significantly affect estrus cycling, it did significantly decrease the lordosis response; the difference was eliminated by estrogen injection. Deprivation also significantly decreased blood plasma refractive index and ovarian weight, but did not affect blood hematocrit or adrenal weight. It was suggested that food deprivation affects the lordosis response by reduction of estrogen levels.
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