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

Background: Meat quality traits are important in pig breeding programs, but they are difficult to include in a traditional selection program. Marker assisted selection (MAS) of meat quality traits is therefore of interest in breeding programs and a Quantitative Trait Locus (QTL) analysis is the key to identifying markers that can be used in MAS. In this study, Landrace and Hampshire intercross and backcross families were used to investigate meat quality traits.

A second mutant allele (V199I) at the PRKAG3 (RN) locus- I. Effect on technological meat quality of pork loin.

The effect of three alleles (RN(-), rn(+) and a second mutant allele V199I, denoted rn*) at the PRKAG3 (RN) locus on such meat quality traits as pH, internal reflectance (FOP), Warner-Bratzler shear force, water-holding capacity and cooking loss were studied. M. longissimus dorsi (LD) from a total of 334 crossbreed pigs, entire males and females, Hampshire (H) and Finnish Landrace (L) of three combinations H × LH, LH × H and LH × LH, were used.

Sensory and meat quality traits of pork in relation to post-slaughter treatment and RN genotype.

The effects on eating quality and meat quality of two different forms of post-slaughter treatment, performed in an abattoir, were studied in carriers and non-carriers of the RN(-) allele. Carcasses were subjected to rapid and slow chilling, and pelvic and Achilles suspension in a factorial experimental design. A temperature of 10 °C was achieved in the centre of M.

The influence of RN genotype, including the new V199I allele, on the eating quality of pork loin.

The eating quality of M. longissimus dorsi (LD) from RN(-) homozygotes, RN(-) heterozygotes and RN(-) non-carriers was investigated in a Swedish Hampshire×Finnish Landrace pig population. The recently identified new allele (V199I, here denoted rn*) at the RN locus was also detected among the pigs selected and included in the sensory evaluation.

Sensory quality and the incidence of PSE of pork in relation to crossbreed and RN phenotype.

The effects of crossbreed and of RN phenotype on pork and its eating quality were evaluated in four different pig crossbreeds [involving Swedish Landrace (L) × Yorkshire (Y) sows and Hampshire (H), Duroc (D), Yorkshire (Y) or Hampshire × Yorkshire (HY) as the terminal sire]. Pigs from the LYH crossbreed were also classified as either carriers or non-carriers of the RN(-) allele. In the crossbreeds investigated, M.

Possible mechanism for the effect of the RN(-) allele on pork tenderness.

The effect of the dominant RN(-) allele on rigor development, ageing and tenderness was studied in M. longissimus dorsi (LD) from 11 heterozygous carriers and five non-carriers of the RN(-) allele. Rigor development was followed by measurements of muscle shortening, isometric tension, pH and FOP.