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Conditional residual (predicted–observed) vs. predicted plots for the different model equations for feather pecking (FP, pecks/bird/min on the lognormal scale) in laying hens. Independent variables included enrichment (Model FP1); enrichment and age (Model FP2); enrichment, age, and housing (Model FP3—final model); enrichment, age, housing and enrichment × housing interaction (Model FP4).
