Genome-wide identification of quantitative trait loci in a cross between Hampshire and Landrace II: Meat quality traits

Table 4 QTL significant at the genome-wide level in a Hampshire x Landrace cross.

		Position	95% CI		Additive	Dominance
Chromosome/Trait	n	(cM)	(cM)	F-value	effect ± SE	effect ± SE	% Var	Model
SSC3
Protein content in LD	175	156	116–172	9.1*	0.4 ± 0.1	0.3 ± 0.2	10.1	HSRNT
SSC6
Water content in LD	175	51	13–147	9.5*	0.4 ± 0.1	-0.3 ± 0.2	10.5	HSRNT
Drip loss in LD day 3–7 (4 days)	268	69	16–178	9.3*	0.6 ± 0.1	0.3 ± 0.2	6.9	HSRNT
ΔpH/h in LD 45 min to 3 h p.m.	279	61	0–89	9.0*	0.05 ± 0.01	0.01 ± 0.02	6.4	HSRNT
Chewing resistance	53	119	0–133	12.3*	9.9 ± 3.5	-25.1 ± 5.2	36.9	HRNT
Tenderness	53	119	0–131	11.0*	-11.3 ± 4.6	31.3 ± 6.8	34.4	HRNT
Chewing time	53	119	0–135	11.0*	8.8 ± 3.1	-20.5 ± 4.6	34.4	HRNT
SSC16
Freezing and cooking loss in LD	289	41	25–78	9.6*	-0.0 ± 0.2	-1.2 ± 0.3	6.5	HSRNT

*5% genome-wide significance
LD – M. longissimus dorsi
p.m.-post mortem
CI – confidence interval
The additive effect was defined as the estimated phenotypic difference between animals homozygous for the Hampshire allele and the mean of the two homozygotes.
The dominance effect was calculated as the phenotypic deviation of the heterozygotes from the mean of the two homozygotes
Var – residual variance explained by the QTL.
Model: H = Herd, S = Sex, RN = PRKAG3/RN-genotype, T = Stunning procedure.

ISSN: 2730-6844