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L-3,4-dihydroxyphenylalanine (L-dopa) concentrations in albumen (A), yolk (B), or oviductal tissue (C) in control or heat stress groups at baseline or after 1, 2, or 3 weeks of heat stress. Significant differences (p < 0.05) were indicated with *. Values are ng per mL of albumen or yolk, or ng per g of oviductal tissue. All values are expressed as mean ± SEM (n = 12 eggs/timepoint/group or for oviductal tissue n = 9–10 ducks/timepoint/group).
