Table 1. Color of laying hens breast slaughtered by halal and gas-stun method with CO₂, Ar and N₂

Traits	Halal	CO7	CO8	CO9	Ar8	Ar9	N9
Lightness (L*)	51.12±1.81abc	52.38±3.70ab	52.78±3.45a	53.57±1.57a	49.61±1.70c	49.85±1.16c	50.08±2.29bc
Redness (a*)	4.72±0.90b	4.73±1.39b	3.37±0.85c	3.36±0.95c	3.79±1.00bc	4.08±0.67bc	6.02±1.21a
Yellowness (b*)	8.01±2.26a	7.67±1.82ab	6.50±1.41bc	7.56±1.74ab	6.08±0.85c	5.84±1.11c	5.73±1.18c

All values are mean±SD.
Means sharing the same letters within a row are not significantly different at p<0.05 by Duncan’s multiple range test.
Treatments: Halal, used knife; CO7, gas stun with 70% carbon dioxide; CO8, gas stun with 80% carbon dioxide; CO9, gas stun with 90% carbon dioxide; Ar8, gas stun with 80% argon; Ar9, gas stun with 90% argon; N9, gas stun with 90% nitrogen.