Biochemical Changes and Biological Origin of Key Odor Compound Generations in Pig Slurry during Indoor Storage Periods: A Pyrosequencing Approach

Table 4

Concentration of odor components at an atmospheric air during different storage periods.

Week		1	2	3	4	5	6	7	8	9	10	11	13	14
Complex odorants (OU)		10,000	14,422	3,000	6,694	14,422	20,800	10,000	4,481	3,000	4,481	10,000	14,422	20,800
Sulfur Compound	H2S	62	297	213	286	145	353	170	334	132	754	1,685	276	227
	MM	186	124	286	131	105	197	173	119	190	249	165	149	149
	DMS	32.4	20.0	20.4	20.0	21.9	20.5	19.4	20.1	19.9	21.6	31.3	18.6	15.8
	CS2	3.38	3.58	4.19	3.70	3.68	4.24	3.86	3.69	4.11	4.13	7.27	4.39	4.06
	DMDS	12.0	13.5	18.6	21.8	30.7	17.7	19.9	8.98	75.3	10.3	11.1	22.3	15.4
VOCs (ppb)	MEK	48.9	59.6	38.0	44.9	39.4	41.6	33.7	42.0	76.9	36.1	37.5	57.1	67.7
	Benzene	0.41	0.41	0.41	0.41	0.41	0.41	0.82	0.41	0.41	0.41	0.41	0.41	0.41
	MIBK	5.04	3.71	0.34	0.34	3.38	3.43	0.34	0.34	2.89	3.94	3.35	3.11	3.12
	Toluene	153	279	112	175	178	211	7.14	33.4	159	278	96.7	12.9	216
	n-Butyl acetate	5.13	5.65	11.0	5.27	0.71	0.71	4.52	4.27	5.66	5.80	0.00	0.71	5.26
	Isobutyl alcohol	10.9	4.45	0.37	0.71	8.61	8.12	7.69	6.73	10.4	7.60	10.5	9.9	11.9
	Ethylbenzene	2.82	2.29	3.14	2.78	2.01	2.80	0.38	0.43	2.68	3.72	1.54	0.43	2.32
	m-Xylene	2.36	2.47	3.02	2.52	2.27	2.67	1.68	1.65	2.63	2.91	2.25	2.51	2.49
	p-Xylene	3.04	3.32	5.46	3.47	2.79	3.70	1.48	1.42	3.58	4.42	2.63	3.47	3.28
	o-Xylene	22.1	24.0	42.0	22.3	14.5	24.2	13.9	13.6	22.7	27.7	20.7	21.9	24.3
	Styrene	4.59	4.87	4.35	4.25	4.65	4.61	3.69	3.53	4.35	3.46	5.27	4.61	5.02
VFA s(ppb)	Acetic acid	1,484	1,619	1,231	1,363	1,109	876	1,002	941	1,573	1,164	895	1,065	1,092
	Propionic acid	671	552	433	515	431	271	324	189	328	247	210	163	198
	Isobutyric acid	48.3	54.3	44.0	50.0	46.6	34.4	39.2	24.0	39.9	28.8	26.7	19.6	24.4
	n-Butyric acid	376	394	328	374	320	215	256	139	304	151	157	167	149
	Isovaleric acid	35.8	41.0	34.2	37.8	35.3	28.0	34.4	22.8	34.9	25.6	25.6	19.3	23.7
	n-Valeric acid	106	105	76.8	83.4	66.1	33.0	49.5	13.4	69.8	15.5	21.4	14.9	15.1
Phenols (ppb)	Phenol	1.84	7.55	1.61	2.82	2.80	2.05	3.09	1.83	3.53	4.15	7.35	1.85	6.77
	p-Cresol	21.7	26.5	26.2	30.1	33.9	31.6	44.6	35.1	41.9	46.3	42.6	31.4	45.6
Indoles (ppb)	Indole	0.40	0.40	0.47	0.40	0.43	0.53	0.40	0.40	0.40	0.40	0.40	0.40	0.52
	Skatole	1.11	1.20	0.49	0.59	0.57	0.74	0.73	0.38	0.41	0.81	1.05	0.38	0.89

H₂S: hydrogen sulfide; MM: methyl mercaptan; DMS: dimethyl sulfide; CS2: carbon disulfide; DMDS: dimethyl disulfide; MEK: methyl ethyl ketone; MIBK: methyl isobutyl ketone.