Table 1 Comparisons of SNPs and microsatellites for main effect and two-way interaction effect screening. Both microsatellite and SNP analyses show a strong and frequent main effect in chromosome 4, whereas epistatic effects are located differently.

Microsatellites

Chr 4

Chr 6, Chr 13, Chr 16

Chr 4 (2 markers^a), Chr 10

Chr 23, Chr 17, Chr 7

Chr 23, Chr 2

Chr 1

Chr 13

Chr 16

Chr 14 (2 markers)

Chr 7

Chr 17

Chr 3

Chr 20

Chr 8 × Chr 15^b

Chr 10 × Chr 17^b

SNPs

Chr 4

Chr 4 (2 markers^a)

Chr 23

Chr 4

Gender

Chr 3, Chr 13

Chr 23

Chr 23 × sex^b

Chr 23

Chr 4, Chr 6

Chr 6, Chr 23

Chr 3

Chr 16

Chr 7, Chr 4

Chr 14