Impact Light Regimen and Melatonin on Growth Performance, Welfare and Physiological Parameters of Broiler Chickens

Abstract The study was conducted to evaluate the effects of lighting program and melatonin on growth performance, welfare, some physiological characteristics broilers. A completely randomized design involved 2 photoperiods (constant 24 L:0 D). intermittent 4 L:2 D) periodically for group one two respectively, third birds were continuous hours with addition 20 mg/kg diet. total 180 unsexed one-day-old ROSS 308 broiler chicks randomly divided into three treatments replicates (20 per replicate). results showed a significant superiority in body weight Gain light compared control treatment broilers at 21 days. No differences performance 38 days, there no dressing percentage, relative internal organs, temperature bird’s parts, biochemical characteristics, hormones, except decrease level ALT treated when raising under program. Intermittently, an improvement antioxidants through MDA. There measures as incidence inflammation hock burn Footpad dermatitis decreased. Results above suggest that system did not affect production but it improved status welfare Indications