. 2016 Aug 22;2(4):282–287. doi: 10.1016/j.aninu.2016.07.006

Table 2.

Effect of ammonia on slaughter performance (%) of broiler chickens.

Item	Ammonia concentration, mg/kg				P-value
Item	<3	25 ± 3	50 ± 3	75 ± 3	P-value
32 d of age
Dressing percentage	92.93 ± 0.40^a	91.27 ± 1.27^b	92.78 ± 0.39^a	91.58 ± 1.29^b	0.005
Semi-eviscerated yield percentage	85.95 ± 1.07	85.62 ± 3.52	82.29 ± 5.04	85.32 ± 4.01	0.182
Eviscerated yield percentage	72.95 ± 0.99^a	69.28 ± 1.11^b	71.70 ± 1.28^a	71.48 ± 3.31^a	0.013
Breast muscle percentage	23.19 ± 3.29	21.81 ± 1.60	20.78 ± 1.31	21.54 ± 1.41	0.079
Thigh muscle percentage	18.06 ± 5.13	15.68 ± 2.32	15.06 ± 4.37	17.44 ± 4.30	0.497
42 d of age
Dressing percentage	91.96 ± 0.35^a	89.38 ± 1.73^b	89.72 ± 1.19^b	89.23 ± 3.22^b	0.047
Semi-eviscerated yield percentage	85.74 ± 0.82	84.28 ± 1.46	83.74 ± 1.43	84.31 ± 1.44	0.052
Eviscerated yield percentage	73.00 ± 0.86^a	72.34 ± 1.57^ab	70.97 ± 1.31^b	72.62 ± 1.26^a	0.035
Breast muscle percentage	23.61 ± 1.06^a	16.11 ± 2.47^c	19.84 ± 2.64^b	22.09 ± 2.28^ab	<0.001
Thigh muscle percentage	20.16 ± 1.82^a	19.34 ± 1.24^ab	18.36 ± 1.48^b	18.02 ± 1.08^b	0.040

^a,b,c Values with the same or no lower case letter in the same row are not significant different (P > 0.05); values with different lower case letters in the same row are significantly different (P < 0.05).