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The effect of restricted feed intake on serum levels of LH (luteinizing hormone) and FSH (follicle-stimulating hormone) was studied as well as the effect of this regime on pituitary gonadotrophin levels in female rats of 2 ages. Low feed was 50% of normal consumption. Low feed rats had lower body weight gains ovary weights and pituitary weights. Older rats gained less weight and had heavier pituitaries than young rats. Pituitary LH concentration was not affected by either feed level or age; pituitary FSH was higher in low-feed groups. Serum LH was reduced in low-feed groups to about 1/2 that in the high-feed groups and there was no detectable differences in serum FSH among groups. Undernutrition appears to act on the pituitary gland by inhibiting hypothalmic production of LH-releasing factor. The elevated pituitary FSH levels in the underfed rats may have been due to accumulation of hormone as a result of absence of the periovulatory release while hormone synthesis and basal secretion remained unchanged.

GONADOTROPHIN LEVELS IN FEMALE RATS SUBJECTED TO RESTRICTED FEED INTAKE