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The albumen corticosterone concentrations (ng/g) of eggs from 43 to 45-week old free-range hens from different rearing treatments (control, novelty, structural) across an implemented stressor period (baseline, immediate, prolonged). The interaction between rearing and stressor treatments was significant (P < 0.006) but a,b,cdissimilar superscript letters indicate the significant difference across stressor time only.
