Light wavelength and duration modulate visfatin, chemerin and oxidative status in broilers

This study investigated the combined effects of light wavelength and photoperiod on adipokine responses, stress-related biomarkers, growth performance, and oxidative status in broilers. A total of 288 one-day-old male Ross 308 broilers were assigned to four treatment groups in a 2 × 2 factorial design based on light colour (white or green) and photoperiod pattern (continuous or intermittent) over a 42-day experiment. Body weight, feed intake, and feed conversion ratio (FCR) were recorded experimental period, and on day 42, serum biomarkers and oxidative stress markers in liver, heart, and kidney tissues were evaluated. Green light reduced serum visfatin and chemerin concentrations compared with white light (P < 0.05). Intermittent lighting reduced corticosterone and heat shock protein 70 concentrations but increased creatine kinase compared with continuous lighting (P < 0.05). Growth performance responses were mainly reflected in body weight and feed intake; FCR responses were limited to specific growth periods, with no significant effect on overall 0-42-day FCR. Among treatment combinations, intermittent-green lighting produced the highest final body weight and increased renal superoxide dismutase (SOD) activity and reduced glutathione (GSH) concentration relative to the other combinations. Overall, these findings indicate that light wavelength and photoperiod jointly influence metabolic, endocrine, and oxidative responses in broilers, and that intermittent green lighting may be considered a practical management approach for modulating selected growth-related and physiological responses under intensive rearing conditions.