Decisions on optimising broiler nutrient density - performance vs economic metrics

Excellent summary Dr Leeson, particularly for all of the industry to include independent poultry Growers and integrated broiler operations. The numerical values that you give are very valuable for our operations.
My experienced is with integrated operations and another factor arises where the profit is calculated when the meat is sold to the grocery store. This factor is plant/packing costs that until the recent declines in ingredient prices were equivalent or higher than live production costs. With these Plant/packing costs, pounds through the plant are critical and an operation may elect higher feed/live costs to produce more pounds to sell. The market, in the US, is currently asking for more broiler meat production via higher prices. However, production is limited by the number of chicks produced and to some degree by the amount of live production broiler houses.
There are Modeling programs that include these live and plant costs [Some are working on the price that various upscale finished products command]. When the modeling programs are adjusted to the production location's costs, the modelling programs are quite accurate in their predictions of performance, costs and returns.












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I would like to express my sincere appreciation to Prof.Leeson for the concise and highly valuable information. My question is this: Under conditions where the quality of feed ingredients is low(for example, very poor-quality soybean meal and similar issues), what is your recommendation regarding nutrient density?
Should we decrease nutrient density in such situations, or increase it? Thanks