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Dietary factors such as the concentrations of protein/amino acids, fat, and starch + sugar and their ratio, may affect the post-absorptive metabolism of energy and protein and energy deposition in the body. In a 2x3 factorial block design, the effects of two dietary crude protein (high protein (HP) vs. low protein (LP) concentrations; 200/190 vs. 170/160 g/kg) in grower and finisher phase and three dietary fat/starch concentrations (high fat (HF); fat and starch 120 and 350 g/kg, respectively, medium fat (MF); fat and starch 80 and 425 g/kg and low fat (LF); fat and starch 40 and 500 g/kg, respectively) on growth performance and body composition of Ross 308 broilers were studied (8 to 38 d). From this experiment it can be concluded that dietary energy source and protein level in isoenergetic diets, balanced for first limiting essential amino acids, influence growth performance and body composition of broilers.

Effect of iso-energetic exchange of dietary fat and starch on growth performance and body composition of broilers : Experiment 2