Advantage feeding sex separated chickens. They found that the ducklings preferred high protein to low protein feeds, resulting in excess protein intake, and higher protein conversion ratios.

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Given a choice between L- and D-lysine, birds ate more of the L form.

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Engku A E A and Forbes J M Growth, food intake and energy balance of layer and broiler chickens offered glucose in the drinking water and the effect of dietary protein content.

British Journal of Nutrition.

Influence of feed particle size on the performance, energy utilization, digestive tract development, and digesta parameters of broiler starters fed wheat- and corn-based diets.

Selection for methionine therefore occurred, but not quite enough to prevent a decline in egg production Hughes

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