Table 4. Effects of supplementation with Bacillus licheniformis and Bacillus subtilis probiotics at different mixing ratios on odor gas emissions in growing pigs

Items	CON	L4S6	L5S5	L6S4	SE	p-value
day 1
Ammonia	11.5	10.8	11.1	11.1	0.1	0.486
Hydrogen sulfide	22.6	21.5	21.8	21.9	0.2	0.417
day 2
Ammonia	18.4	17.1	16.5	17.8	0.3	0.571
Hydrogen sulfide	24.3	24	24.1	23.7	0.1	0.631
day 3
Ammonia	26.3	27.4	27.1	25.1	0.5	0.432
Hydrogen sulfide	27.5	25.1	25.7	24.8	0.4	0.185
day 4
Ammonia	30.2	29.1	28.7	29.5	1.0	0.091
Hydrogen sulfide	38.7^a	32.5^b	34.8^b	35.1^ab	0.9	0.049
day 5
Ammonia	41.5	37.4	38.5	38.6	1.1	0.078
Hydrogen sulfide	50.1^a	41.9^b	43.4^b	46.7^ab	1.5	0.032
day 6
Ammonia	71.5^a	60.1^b	63.4^b	68.9^ab	2.8	0.041
Hydrogen sulfide	60.7^a	55.8^b	56.8^b	57.4^b	1.1	0.025
day 7
Ammonia	131.5^a	71.4^b	80.5^b	86.8^b	3.4	0.010
Hydrogen sulfide	81.7^a	63.3^b	67.5^b	70.1^b	1.9	< 0.001

Each value is presented as the mean value of four replicates (1 pig / cage; 4 × 4 latin square).
Means in the same row with different superscripts differ significantly (p < 0.05).
CON, basal diet; L4S6, CON + 0.2% probiotic complex (B. licheniformis and B. subtilis at a 4:6 ratio); L5S5, CON + 0.2% probiotic complex (B. licheniformis and B. subtilis at a 5:5 ratio); L6S4, CON + 0.2% probiotic complex (B. licheniformis and B. subtilis at a 6:4 ratio).