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Three experiments were done to examine the effects of food restriction, beginning at 21 days of age, on loss of primordial follicles and on concentrations of gonadotropins and sex steroids in rats. In Experiment 1, food restriction (FR) from 21 to 51-55 days of age had no effect on number of primordial follicles, but increased the plasma concentration (p less than 0.05) of follicle stimulating hormone (FSH). (p less than 0.05). In Experiment 2, comparisons were made of groups of rats (1) fed ad libitum (AL) (2) hypophysectomized at 21 days of age and fed ad libitum (AL-HY), (3) food restriction from 21 to 52-58 days of age (FR), and (4) food restriction with twice-daily injections of follicular fluid (FR-FF). Hypophysectomy was the only treatment that decreased the loss of primordial follicles (p less than 0.001). Concentrations of FSH were decreased in AL-HY and increased in FR and FR-FF rats (144 +/- 13, 53 +/- 15, 275 +/- 30 and 359 +/- 56 ng/ml in AL, AL-HY, FR and FR-FF rats, respectively). Concentrations of luteinizing hormone (LH) were lower (p less than 0.05) in AL-HY, FR and FR-FF rats than in AL rats. In Experiment 3, AL and FR rats were unilaterally ovariectomized (ULO) at 30 days of age. Blood samples were taken 5 days prior to ULO, at ULO and at 12 h, 5 days, and 22-28 days after ULO.(ABSTRACT TRUNCATED AT 250 WORDS)

The Effects of Food Restriction and Hypophysectomy on Numbers of Primordial Follicles and Concentrations of Hormones in Rats1