Table 1. Summary of RNA-seq alignment.

Sample ID	Total tags (Million)	Mapping rate%	CDS exons (%)	5' UTR (%)	3'UTR (%)	Intron (%)
H611	44.92	79.98	65.20	1.73	11.90	5.42
H1103	42.73	80.91	67.88	1.76	11.74	4.70
H710	47.36	82.69	72.90	1.57	10.20	3.51
H712	43.69	85.79	71.00	1.08	10.32	4.52
H906	45.26	82.96	68.69	1.54	11.47	4.50
H909	39.29	85.79	66.94	1.05	11.20	6.04

BH: Songliao Black pigs with higher backfat of live group

BL:Songliao Black pigs with lower backfat of live group

H710, H712 and H906, H909 are two pair full-sibs pigs. H710, H906,H611 and H712, H909, H1103 are the BH and BL groups respectively.