
Effects of vitamin A on the milk performance, antioxidant functions and immune functions of dairy cows
Keywords: ایمونوگلوبولین G، پادتن جی; ADF, acid detergent fibre; BC, beta-carotene; BW, body weight; CAT, catalase; DM, dry matter; DTNB, dithio-bis-nitrobenzoic acid; ELISA, enzyme-linked immunosorbent assay; GPx, glutathione peroxidase; IgA, immunoglobulin A; IgG, immunoglobulin G; IgM, imm