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Mean relative total gut length (cm) of broilers fed either corn-soy based diets or wheat-palm oil-rapeseed based diets, added or not with chestnut wood tannins at two different doses (T−: 0 mg/kg, T+: 500 mg/kg, and T++: 2,000 mg/kg) at 25 d of age (n = 12). Pairwise comparison tests (t test): P-value < 0.001 = ***; 0.001 < P < 0.01 = **; 0.01 < P < 0.05 = *; P > 0.1 = ns.
