Replacement of soybean meal with roasted full-fat ...

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Title Replacement of soybean meal with roasted full-fat soybeans from high-protein or conventional cultivars in diets for broiler chickens
Author(s) R. M. G. Hamilton, Mary A. McNiven
Journal Canadian Journal of Animal Science
Date 2000
Volume 80
Issue 3
Start page 483
End page 488
Abstract The effects were examined of replacing part or all of the soyabean meal in the starter and finisher diets for male broiler chickens with ground, roasted, full-fat soyabeans from either a high-protein (AC Proteus) or conventional (Baron) cultivar. The starter (1-21 days) and finisher (22-36 days) diets were formulated by replacing, on an isonitrogenous basis, part or all of the soyabean meal in the barley-wheat-based control diets with the roasted soyabeans. Digestibility of dry matter, corrected nitrogen and energy were estimated by an index method for the last 2 days of the starter and grower periods. Soyabean level influenced body weight gains directly in a quadratic manner, and feed intakes or feed conversions by inversely linear relationships (P<0.05 and P<0.01) during the starter period. Performance during the finisher period or during the entire growth period was not influenced by dietary soyabean source. Dry matter and energy digestibilities at both 21 and 35 days, and nitrogen at 35 days were affected in a quadratic manner (P<0.05 or P<0.01) by the soyabean level of the diets, whereas, a linear relationship was present for the apparent metabolizable energy (AME) content (P<0.001). Soyabean source had no effect on nutrient utilization, except for dry matter or energy digestibility during the starter period (P<0.01). In conclusion, the optimal performance should be obtained when the ratio of roasted full-fat soyabeans to soyabean meal is about 2:1 in the starter feeds for broiler chickens..
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