Table 2.

Relative abundance of urinary volatiles in the four groups.

GC peak	RT min	Compounds	BB	CC	BC	CB
1	4.83	Z-5,5-dimethyl-2-ethylidenetetrahydrofuran	2.53 ± 1.47	2.43 ± 0.68	1.95 ± 0.64	2.43 ± 1.19
2	5.14	2-Heptanone	0.40 ± 0.83	0.20 ± 0.30	0.07 ± 0.04	0.11 ± 0.13
3	5.24	E-5-Hepten-2-one	0.59 ± 0.44	0.54 ± 0.37	0.39 ± 0.20	0.55 ± 0.35
4	5.50	E-5,5-dimethyl-2-ethylidenetetrahydrofuran	0.95 ± 0.52	0.83 ± 0.24	0.70 ± 0.21	0.87 ± 0.41
5	5.55	Z-2-pentenyl acetate	0.05 ± 0.12a	0.14 ± 0.11a,b,c	0.03 ± 0.07b	0.01 ± 0.02c
6	5.77	Dimethyl sulfone 6-Hydroxy-6-methyl-3-heptanone and	10.5 ± 7.20a,b,c	6.10 ± 2.12a,d	5.62 ± 3.31b	4.42 ± 2.53c,d
7	7.43	5,5-dimethyl-2-ethyltetrahydrofuran-2ol	57.7 ± 9.72	68.0 ± 10.3	67.3 ± 12.7	69.0 ± 11.6
8	8.45	Benzyl alcohol	6.34 ± 4.00	4.87 ± 3.59	5.79 ± 2.54	5.83 ± 2.10
9	8.88	R,R-3,4-Dehydro-exo-brevicomin	6.63 ± 3.36a,b,c	2.53 ± 1.53a	3.53 ± 2.01b	2.18 ± 1.23b,c
10	9.34	Acetophenone	0.19 ± 0.12	0.13 ± 0.05	0.23 ± 0.11	0.19 ± 0.06
11	9.48	O-Toluidine	0.65 ± 0.30a,b,c	0.32 ± 0.25a	0.21 ± 0.18b	0.26 ± 0.21c
12	10.36	(S)-2-Sec-butyl-4,5-dihydrothiazole	10.9 ± 6.50	13.2 ± 5.61	13.2 ± 6.99	13.1 ± 8.29
13	13.38	N-Phenyl formanide	2.55 ± 0.89a,b,c	0.75 ± 0.51a	0.93 ± 0.40b	1.04 ± 0.28c

Data are presented as mean ± SD, n = 8 for each group; compounds were identified using mass library (NIST 2002). ^a–fMeans in a row marked by a same superscript letter show significant differences (P < 0.05, using one-way ANOVA with LSD post hoc t-test or Kruskal–Wallis H with post hoc Mann–Whitney U test). BB: BALB/c strain; CC: C57BL/6 strain; BC: hybrid of BALB♀ × C57♂; CB: hybrid of C57♀ × BALB♂; RT: retention time.