Effect of Dietary Crude Protein Reduction Levels on Performance, Nutrient Digestibility, Nitrogen Utilization, Blood Parameters, Meat Quality, and Welfare Index of Broilers in Welfare-Friendly Environments.

Ether extract digestibility exhibited a more complex pattern, with no significant linear effect but a highly significant quadratic effect ( p < 0.001). 3.3.

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The linear effect was significant ( p = 0.006), indicating a clear trend of decreasing corticosterone with lower CP levels, while the quadratic effect was not significant ( p = 0.524).

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