Keywords: تانین; Theanine; Heat stress; Liver injury; Heat shock response; HPA axis; ACTH; adrenocorticotropic hormone; ALT; alanine aminotransferase; AST; aspartate aminotransferase; CAT; catalase; CORT; glucocorticoids; COX-2; cyclooxygenase-2; CRP; C-reaction protein;