Journal of Nutrition OpenSOurce Diets- www.ResearchDiets.com

Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
QUICK SEARCH:   [advanced]


     

Journal of Nutrition Vol. 116 No. 8 August 1986, pp. 1529-1539
Copyright © 1986 by American Society for Nutrition
This Article
Right arrow Full Text (PDF)
Right arrow Purchase Article
Right arrow View Shopping Cart
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Sainz, R. D.
Right arrow Articles by Baldwin, R. L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Sainz, R. D.
Right arrow Articles by Baldwin, R. L.

Relationships among Dietary Protein, Feed Intake and Changes in Body and Tissue Composition of Lactating Rats

R. D. Sainz1, C. C. Calvert2 and R. L. Baldwin

Department of Animal Science, University of California, Davis, CA 95616

To quantify effects of protein and energy intake on changes in tissue composition in lactating rats, 36 rats were fed three diets (L, M and H, containing 12, 24, and 36% protein, respectively) at four levels of intake (100, 70, 50 and 30% of ad libitum) from d 7 to 14 of lactation. Three rats per treatment were killed on d 14; carcass, viscera, liver and mammary glands were dissected and analyzed for water, fat, protein and ash. Twelve rats killed on d 7 provided initial composition estimates. All rats lost weight; weight loss was affected slightly by diet but drastically by intake, ranging from 22.4 g in ad libitum-fed rats to 79.9 g in the 30% group. Fat losses, mostly from carcass, were insensitive to diet but were increased to maximum at the 70% intake level, and further restriction did not result in significantly greater fat losses. Protein losses in all tissues increased with degree of feed restriction. Protein losses in viscera, liver and mammary decreased with higher dietary protein. Possible homeorhetic adaptations responsible for these patterns of nutrient partition are discussed in terms of changes in rates of fat and protein turnover and hormonal effects upon these rates.

KEY WORDS: • protein • energy • lactation • body composition • tissue composition • rats

1 Supported in part by a Ralston Purina Graduate Research Fellowship. Submitted in partial fulfillment of requirements for Ph.D.

2 To whom reprint requests should be addressed.

Manuscript received 25 June 1985. Revision accepted 12 March 1986.






Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]