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Title: Effects of substitution between fat and protein on feed intake and its regulatory mechanisms in broiler chickens: Endocrine functioning and intermediary metabolism
Authors: Swennen, Quirine ×
Janssens, GPJ
Millet, S
Vansant, Margareta
Decuypere, Eddy
Buyse, Johan #
Issue Date: Jul-2005
Publisher: Poultry science assoc inc
Series Title: Poultry science vol:84 issue:7 pages:1051-1057
Abstract: The aim of this study was to investigate the influence of dietary macronutrient ratio on postprandial (5 or 48 h after refeeding) endocrine functioning and metabolites of the intermediary metabolism and to relate these parameters with dietary-induced alterations in energy, protein, and lipid metabolism. Male broilers were reared from 1 to 7 wk of age on isoenergetic diets with substitutions between fat and protein but similar carbohydrate contents [low protein (LP): 126 vs. 242 g protein/ kg; low fat (LF): 43 vs. 106 g fat/kg]. The LP chickens had significantly increased postprandial plasma triglyceride levels. This was likely the result of stimulated hepatic lipogenesis, as corroborated by their significantly higher respiratory quotients. Plasma free fatty acid concentrations were higher in LP broilers, whereas glucose levels were unaffected by dietary composition, suggesting that these chickens preferred carbohydrates as an energy source over free fatty acids. Plasma uric acid levels were lower in LP compared with LF chickens, indicating a more efficient protein retention in the former group. LP birds that were fasted and refed at 48 h had higher plasma 3,5,3'-triiodothyronine (T-3) levels, corroborating their increased heat production. The postprandial T-3 increase was more pronounced in the LF chickens, possibly induced by their higher protein consumption.
URI: 
ISSN: 0032-5791
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Livestock-Nutrition-Quality (-)
Environment and Health - miscellaneous
Nutrition (-)
× corresponding author
# (joint) last author

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