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Effect of dietary ginger root extract on delayed-type hypersensitivity response (24 h post-PHAP injection). The data are expressed as means ± SEM, with n = 12 per treatment; a, b means without a common superscript are different. Statistically significant differences are indicated with P < 0.05. GRE-1, GRE-2, GRE-3, and GRE-4 consisted of chicks fed diets supplemented with ginger root extract at 0.375 g/kg, 0.75 g/kg, 1.5 g/kg, and 3 g/kg level of the diet, respectively.
