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The model shown in the current publication is based on an equation system developed in a previous publication (Carre et al., 2015). An equation (D) describing protein deposition as a function of protein intake is added to this previous system, in order to obtain a complete description of growth and feed intake depending on feed composition and genetic features of broilers. A calculation is conducted for lean and fat lines with various dietary protein contents. Lean and fat lines are distinguished through the equation expressing lipid deposition as a function of [protein/energy] ratio and protein efficiency, and through the equation (D). The model provides results that are typical of differences between lean and fat lines, with a higher dietary protein recommendation for lean than for fat line, lower feed conversion ratios (FCR) in lean than in fat line, and higher protein efficiencies in lean than in fat line.

A model for calculation of growth and feed intake in broiler chickens on the basis of feed composition and genetic features of broilers