Evaluation of the Antioxidant Status of Ethanolic Extract of Hypericum perforatum and Its Effect on Performance, Immune System, Antioxidant Status and Plasma Biochemical Indices of Broiler Chickens. - Seraji-Kopkan H; Hosseini-Vashan SJ; Afzali N; Namaei MH (Veterinary medicine and science, 2026)