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Journal of Nutrition Vol. 117 No. 11 November 1987, pp. 1959-1966
Copyright © 1987 by American Society for Nutrition
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Effect of Repeated Reproductive Cycles on Pregnancy Outcome in Ad Libitum-Fed and Chronically Food-Restricted Rats1,2,

Kathleen M. Rasmussen and Karen L. Fischbeck

Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853

To evaluate the combined effects of repeated, closely spaced reproductive cycles and dietary intake on maternal nutritional status and pregnancy outcome, rats were fed ad libitum or 75 or 60% of ad libitum intake. Dietary treatment began 28 d before breeding and continued through two reproductive cycles. Underfed rats gained less weight during pregnancy and had fewer and lighter pups at parturition. During the third week of the first lactation and between weaning and the second conception, underfed rats gained weight, whereas the controls lost weight. Underfed dams gained more weight in the second pregnancy and retained more weight than in the first pregnancy. Dams and pups in all groups were larger at the second parturition. The results indicate that net weight gain both during pregnancy and between reproductive cycles contributed to the ability of underfed dams to produce larger young at the second birth.

KEY WORDS: • parity • birth order • malnutrition • pregnancy • rats

1 This research was supported by a New Investigator Research Award to K. M. Rasmussen from the National Institutes of Health (HD-14953).

2 Presented in part at the annual meeting of the Federation of American Societies for Experimental Biology, Anaheim, CA, April 1985 [Fischbeck, K. L. & Rasmussen, K. M. (1985) Repeated reproductive cycles in chronically underfed rats fail to compromise lactational performance, body composition, and pup growth. Fed. Proc. 44: 1854 (abs. 8426)].

Manuscript received 20 October 1986. Revision accepted 29 July 1987.






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