Table 3 . Single QTL mapping.

Phenotype	Chromosome	Position (cM)	LOD scorea	Position (Mb)	1.5-LOD interval (Mb)	DDb	DMb	MMb
Relative right testis weight	2	30	5.41	96.0	52.2–123.9	3.64 ± 0.13	4.40 ± 0.09	4.43 ± 0.14
	4	45.9	8.66	108.9	98.8–115.3	4.68 ± 0.12	4.28 ± 0.08	3.49 ± 0.14
	10	20	6.36	69.3	55.1–87.4	3.81 ± 0.12	4.20 ± 0.09	4.80 ± 0.13
Sperm density	X	0	3.28	10.2	10.2–45.1	13.82 ± 0.62	—	10.81 ± 0.58
Sperm density (binary)	17	13.3	6.00	30.0	3.1–65.2	0.85 ± 0.04	0.77 ± 0.03	1.00 ± 0.05
Sperm head PC1c	X	18	50.95	68.9	58.3–71.3	0.061 ± 0.004	—	−0.056 ± 0.004
Seminiferous tubule aread	18	34	4.36	69.6	60.3–80.0	2681.17 ± 880.56	−859.17 ± 486.73	−610.82 ± 638.18
Proximal bent taile	10	10	4.20	47.6	32.6–84.3	0.24 ± 0.02	0.18 ± 0.01	0.15 ± 0.02
	X	24.5	8.77	90.8	58.3–97.4	0.14 ± 0.01	—	0.23 ± 0.01
Distal bent taile	3	22	4.34	51.4	30.0–75.9	0.18 ± 0.01	0.13 ± 0.01	0.12 ± 0.01
	5	70	7.20	146.4	133.0–148.4	0.20 ± 0.01	0.13 ± 0.01	0.12 ± 0.01
	X	16	7.23	67.8	52.5–96.4	0.11 ± 0.01	—	0.17 ± 0.01
Headless/taillesse	15	0	3.67	16.5	16.5–48.2	0.33 ± 0.02	0.34 ± 0.01	0.41 ± 0.02
	X	2	3.20	18.7	10.2–96.4	0.32 ± 0.01	—	0.38 ± 0.01
Amorphous sperm heade	X	15.9	10.28	67.7	48.6–71.3	0.13 ± 0.01	—	0.21 ± 0.01
Total abnormal sperme	5	64	4.25	138.2	122.4–148.4	0.60 ± 0.03	0.45 ± 0.02	0.47 ± 0.03
	15	4	3.85	27.1	16.5–77.2	0.46 ± 0.03	0.45 ± 0.02	0.59 ± 0.03
	X	16	9.73	67.8	52.5–93.4	0.40 ± 0.017	—	0.57 ± 0.016

^aAll QTL are significant at a 5% significance threshold.

^bPhenotype means of each genotype (±SE). D, M. m. domesticus^WSB; M, M. m. musculus^PWD.

^cLower values of PC1 are correlated with higher levels of sterility.

^dResidual trait scores of seminiferous tubule area regressed on testis weight. Lower values are correlated with higher levels of sterility.

^eArcsine square-root-transformed.