PMID: 9165002May 1, 1997Paper

Food supplementation during lactation shortens anestrus and elevates gonadotropins in rats

The Journal of Nutrition
E GournisK M Rasmussen

Abstract

Breastfeeding delays the resumption of ovulation in women, a phenomenon particularly important in less developed areas. Although human and animal studies indicate that undernutrition extends the period of lactational anestrus, the effect of improving nutritional status during lactation on this time of infecundability, however, is less clear. To assess the effects of food supplementation on duration of lactational anestrus, Sprague-Dawley rats were assigned to one of three dietary groups: 1) control (C), given unrestricted access to diet AIN-76A; 2) food-restricted (FR), fed 50% of the control intake; and 3) food-supplemented (FS), food-restricted until d 0 of lactation and thereafter given unrestricted access to diet AIN-76A. Time to first detectable proestrus was monitored starting on d 10 of lactation. Nursing behaviors and gonadotropin and prolactin concentrations were measured in both intact and ovariectomized dams on d 10, 15 and 20 of lactation; we report these data only on the ovariectomized group, which represents the more appropriate animal model of human reproductive physiology during lactation. Proestrus returned significantly (P < 0.0001) sooner in both FS (18.1 +/- 2.4 d) and C (18.0 +/- 2.9 d) than in FR (28.8 +/-...Continue Reading

References

Apr 1, 1991·The Journal of Endocrinology·K Taya, S Sasamoto
Jul 1, 1990·Domestic Animal Endocrinology·R W Canfield, W R Butler
Sep 1, 1990·Developmental Psychobiology·J E Jans, B C Woodside
Dec 1, 1987·The American Journal of Clinical Nutrition·R L Kliewer, K M Rasmussen
Jun 27, 1981·Lancet·P LunnR G Whitehead
Nov 1, 1980·Developmental Psychobiology·L S Crnic
Jun 1, 1982·The American Journal of Clinical Nutrition·H L DelgadoR E Klein
Jul 1, 1982·Journal of Reproduction and Fertility·P W Howie, A S McNeilly
Nov 1, 1993·Physiology & Behavior·K J Schulze, K M Rasmussen
Dec 1, 1995·Physiology & Behavior·M K McGuireK M Rasmussen

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