A locally congenic backcross design in pig: a new regional fine QTL mapping approach miming congenic strains used in mouse

Table 1 QTL detection results obtained for backfat thickness, meat percentage, G2 and M2 traits

Sire	Dams local genotype	Trait^a	Number of offspring	Maximum LRT	Position	QTL Effect	Phenotypic SD	Significance^b
0179	LW/LW	BFT	147	8,9	140	-0,52	1,90	*
		Meat percentage	78	9	130	0,69	1,63	*
		G2	78	5,9	132	-0,88	2,56	-
		M2	78	6,6	129	1,34	3,68	*
0180	LW/LW	BFT	79	7,4	136	-0,69	1,97	*
		Meat percentage	43	10,1	119	0,91	1,59	*
		G2	43	11,7	119	-1,49	2,39	**
		M2	43	0,5	136	-0,55	4,53	-
0332	LW/LW	BFT	154	8,4	140,8	-0,50	1,92	*
		Meat percentage	86	9,9	97,8	1,03	2,28	*
		G2	85	13,4	110,8	-1,04	1,90	**
		M2	85	5,5	100,8	1,06	3,44	-
1357	LW/LW	BFT	149	0,9	119	-0,16	1,85	-
		Meat percentage	140	0,8	128	-0,13	1,59	-
		G2	139	1,9	128	0,29	2,26	-
		M2	139	4	136	0,71	3,87	-
1357	MS/MS	BFT	133	25,4	140	-1,09	2,19	****
		Meat percentage	126	54,4	142	1,38	1,71	****
		G2	126	45	143	-1,95	2,73	****
		M2	126	16,1	151	1,43	3,52	***
1462	MS/MS	BFT	150	1,1	132	-0,22	2,25	-
		Meat percentage	121	4,2	134	0,37	1,70	-
		G2	121	3,2	134	-0,50	2,65	-
		M2	121	4,9	132	0,99	4,24	-
2551	MS/MS	BFT	101	43,5	140	-1,63	2,08	****
		Meat percentage	89	37,1	141	1,59	2,09	****
		G2	89	37,1	148	-1,98	2,51	****
		M2	89	9,1	148	1,23	3,44	*
0012	MS/MS	BFT	177	49,8	138	-1,60	2,66	****
		Meat percentage	115	23,6	140	1,28	2,51	****
		G2	115	31,6	141	-1,79	2,96	****
		M2	115	4,8	136	0,90	4,04	-

^a: trait units are mm for G2, M2 et BFT (Back Fat Thickness) and % for Meat percentage.
^b: - Non significant; * P < 0.05; ** P < 0.01, *** P < 0.003 and **** P < 5.10^-5
Maximum likelihood ratio test value (Maximum LRT), corresponding significance level, position (cM), QTL substitution effects (in trait units), and within family standard deviation (SD) are given for the 7 sires retained in the scheme, depending on the dam genotypes in the chromosomic region of interest.

ISSN: 2730-6844