Abstract
SUMMARY A trial was conducted to evaluate the effect of type of protein and energy sources in pre-starter diet on performance, intestinal microflora and gut morphology in broiler chickens. Pre-starter diets were a 4 × 4 factorial design with 4 levels of isolated soy protein (ISP; 0, 1.5, 3.0, and 4.5%) and 4 levels of broken rice (0, 6, 12, and 18%). All pre-starter diets were formulated to be isocaloric and isonitrogenous. A common commercial grower and finisher diet was fed to all birds from 11 to 24 and 25 to 42 d of age, respectively. Birds fed pre-starter diet contained 4.5% and 18% or 3% and 6% and/or 1.5% and 18% ISP and broken rice, respectively had higher (P
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