Document Detail

Carry-over effects of dietary crude protein and triiodothyronine (T3) in broiler chickens.
MedLine Citation:
PMID:  8672409     Owner:  NLM     Status:  MEDLINE    
Indian River male broiler chickens growing from 7 to 30 d of age were fed on diets containing crude protein levels ranging from 120 to 300 g/kg plus 0 or 1 mg triiodothyronine (T3)/kg diet. The purpose of this study was to examine the effects of these treatments on lipogenesis after a common diet was fed (180 g crude protein/kg diet from 30 to 56 d of age). Dietary treatment groups were sampled at 30 and 56 d. In vitro lipogenesis was determined by incubating liver explants for 2 h at 37 degrees in Hanks' salts containing 25 mM-HEPES and 10 mM-[2-14C]acetate and then measuring acetate incorporation into total lipid. Growth and feed consumption from 7 to 30 d increased (P < 0.01) as dietary protein increased from 120 to 210 g/kg diet. Both measurements decreased as crude protein increased from 210 to 300 g/kg diet. T3 decreased (P < 0.01) growth and feed intake during this period. Low-protein (< 180 g/kg) diets increased (P < 0.05) and T3 decreased lipogenesis in 30-d-old chickens. Although birds given T3 from 7 to 30 d grew at the greatest rate from 30 to 56 d of age, the final body weight was still less than controls. In vitro lipogenesis at 56 d of age was not affected by either of the two dietary treatments. In contrast, the relative size of the abdominal fat pad (g/kg body weight) at 56 d was decreased by feeding T3 from 7 to 30 d. Any changes in metabolism elicited by either dietary protein levels or hormone treatments may be specific to the particular dosing interval and are not sustained when a common diet is fed during a repletion period.
R W Rosebrough; A D Mitchell; J P McMurtry
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Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article    
Journal Detail:
Title:  The British journal of nutrition     Volume:  75     ISSN:  0007-1145     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  1996 Apr 
Date Detail:
Created Date:  1996-08-09     Completed Date:  1996-08-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  573-81     Citation Subset:  IM    
United States Department of Agriculture-Agricultural Research Service, Beltsville, MD 20705, USA.
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MeSH Terms
Adipose Tissue / metabolism
Body Composition
Body Weight / drug effects
Chickens / growth & development,  metabolism*
Dietary Proteins / administration & dosage*
Insulin-Like Growth Factor I / analysis
Lipids / biosynthesis*
Lipoprotein Lipase / metabolism
Liver / metabolism
Thyroxine / blood
Triiodothyronine / blood,  pharmacology*
Reg. No./Substance:
0/Dietary Proteins; 0/Lipids; 67763-96-6/Insulin-Like Growth Factor I; 6893-02-3/Triiodothyronine; 7488-70-2/Thyroxine; EC Lipase

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