Document Detail

Chronic food restriction amplifies the effect of lactation on the duration of postpartum anestrus in rats.
MedLine Citation:
PMID:  1640267     Owner:  NLM     Status:  MEDLINE    
We studied the effects of food intake and lactation on the duration of postpartum infecundability in rats. Sprague-Dawley rats were given free access to a purified diet (AIN-76A) or a similar diet (modified to contain twice the concentrations of vitamins and minerals) in amounts equal to 50% of that consumed by controls. At -65 d of age, animals were bred. At parturition, dams were allowed to nurse 4-5 pups, or all pups were removed. Thus, four groups were created: lactating control (n = 11), nonlactating control (n = 11), lactating food restricted (n = 8), and nonlactating food restricted (n = 10). Vaginal cytology was observed twice daily for the detection of proestrus, which occurred at 4.5 +/- 0.5 and 6.7 +/- 0.5 d (mean +/- SD) postpartum in nonlactating control and food restricted groups, respectively (P less than 0.005), and at 16.5 +/- 0.5 and 28.8 +/- 0.5 d postpartum in lactating control and food restricted groups, respectively (P less than 0.0001). The interaction between food intake and lactation was significant (P less than 0.0001). These results indicate that maternal food restriction exacerbates the effects of lactation in prolonging postpartum anestrus.
M K McGuire; W R Butler; K M Rasmussen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of nutrition     Volume:  122     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  1992 Aug 
Date Detail:
Created Date:  1992-09-01     Completed Date:  1992-09-01     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1726-30     Citation Subset:  IM    
Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853.
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MeSH Terms
Anestrus / physiology*
Body Weight
Food Deprivation*
Lactation / physiology*
Postpartum Period / physiology*
Rats, Inbred Strains
Grant Support

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