author(s)
Shaista Saeedatu Nissa, IU Sheikh, MT Banday, Bushra Zaffer, Shehrish Shafiq, Asma Irshad Qureshi, Sheikh Shubeena and Subata Mehboob

abstract
An experiment was carried out to investigate the effect of different light sources on the carcass characteristics, abdominal fat and carcass grading of broilers. One hundred and sixty day old broiler chicks were procured from reputed sources. The chicks brooded in battery cages for a period of one week. On 8^th day the chicks were distributed randomly into four treatment groups viz., Natural light (T₁) as Control, Incandescent (T₂), CFL (T₃) and LED (T4) having 40 chicks in each groups, each group having four replicates of 10 chicks each. The percent blood loss was recorded to be 4.67± 0.05, 4.62 ± 0.05, 4.67± 0.04 and 4.63± 0.05 for T₁, T₂, T₃ and T₄ groups, respectively. The percent feather loss was recorded to be 6.55 ± 0.09, 6.49 ± 0.06, 6.60 ± 0.06 and 6.53 ± 0.06 respectively, for T₁, T₂, T₃ and T₄ groups. Statistically, no significant difference was observed among the different treatment groups for blood loss, feather loss, eviscerated yield and dressing yields and giblet yields. The percent of different cut-up parts were found to be differed non-significantly among the different treatment groups. . The broilers reared under T₁ (Control), T₃ (CFL) and T₄ (LED) groups scored visual carcass score grade 1 while as the broilers reared under T₂ (Incandescent) group scored visual carcass score grade 2. The percent abdominal fat was significantly higher in T₁ (1.40 ± 0.10) followed by T₄ (1.29 ± 0.06), T₃ (1.05 ± 0.13) and T₂ (1.02 ± 0.09) groups. Therefore rearing birds under these new light sources does not affect the carcass grading and other characteristics.