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Further studies on carry-over effects of dietary crude protein and triiodothyronine (T3) in broiler chickens*

Published online by Cambridge University Press:  09 March 2007

R. W. Rosebrough ,
J. P. McMurtry  and
R. Vasilatos-Younken
R. W. Rosebrough*
Affiliation:
Growth Biology Laboratory, Livestock and Poultry Science Institute, United States Department of Agriculture–Agricultural Research Service, Beltsville Agricultural Research Center, Beltsville, MD 20705, USA
J. P. McMurtry
Affiliation:
Growth Biology Laboratory, Livestock and Poultry Science Institute, United States Department of Agriculture–Agricultural Research Service, Beltsville Agricultural Research Center, Beltsville, MD 20705, USA
R. Vasilatos-Younken
Affiliation:
Department of Poultry Science, The Pennsylvania State University, University Park, PA 16802, USA
*
†Corresponding author:Dr R. W. Rosebrough, fax + 1 301 504 8623, email Rosebro@GGPL.ARSUSDA.GOV
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Abstract

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Indian River male broiler chickens growing from 7 to 28 d of age were fed on diets containing either 120 or 210 g crude protein and 0 or 1 mg triiodothyronine (T3)/kg diet to study in vitro lipogenesis (IVL). In addition, a carry-over period (180 g crude protein/kg diet from 28 to 40 d of age) was used to test the persistence of prior treatment effects. The higher protein level increased, but T3 decreased (P < 0.01) growth and feed consumption at 28 d of age. The lower protein level increased (P < 0.05) and T3 decreased IVL in 28-d-old chickens. These effects were only sustained for 6 d following the switch to a common diet at 28 d. IVL at 40 d of age was not affected by either crude protein or T3 fed during the 7–28 d period. The higher protein level increased plasma insulin-like growth factor-1 during the period from 7 to 28 d; however, this effect lasted for only 6 d following the switch to a common diet. Plasma growth hormone (GH) at 28 d of age was inversely related to dietary protein level. Changing to a common level of crude protein did not change plasma GH values at 12 d, indicating that the nutritional state of the young chicken may affect GH at a later period of life. Metabolic changes noted in this study were rapid and maintained for a short period of time following the feeding of a common diet.

Lipogenesis: Dietary protein: Triiodothyronine

Keywords

LipogenesisDietary proteinTriiodothyronine
Type
Animal Nutrition
Information
British Journal of Nutrition , Volume 79 , Issue 1 , January 1998 , pp. 89 - 95
Copyright
Copyright © The Nutrition Society 1998

Footnotes

*

Mention of a trade name, proprietary product or specific equipment is not a guarantee or a warranty by the US Department of Agriculture and does not imply an approval to the exclusion of other products

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