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The effect of skeletal muscle ryanodine receptor genotype on pig performance and carcass quality traits

Published online by Cambridge University Press:  02 September 2010

W. E. Rempel ,
Ming Yu Lu ,
J. R. Mickelson  and
C. F. Louis
W. E. Rempel
Affiliation:
Departments of Animal Science, University of Minnesota, St Paul, Minnesota 55108, USA
Ming Yu Lu
Affiliation:
Departments of Animal Science, University of Minnesota, St Paul, Minnesota 55108, USA
J. R. Mickelson
Affiliation:
Departments of Veterinary Pathobiology, University of Minnesota, St Paul, Minnesota 55108, USA
C. F. Louis
Affiliation:
Departments of Veterinary Pathobiology, University of Minnesota, St Paul, Minnesota 55108, USA Departments of Biochemistry, University of Minnesota, St Paul, Minnesota 55108, USA
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Abstract

Six different breed groups (Yorkshire (Y), Pietrain (P), a Pietmin derivative breed Near Pietrain (NP), and crosses NP × P, P × NP and F2) were tested for breed, skeltal muscle ryrl genotype (hal gene), and sex effects on growth, performance and carcass traits. Within the C/C (homozygous normal for the hal gene) or T/T (homozygous recessive for the hal gene) ryrl genotypes there were significant differences among breed groups in a number of performance and carcass quality traits. In contrast, the performance and carcass quality traits of the C/T (heterozygous for the hal gene) ryrl genotype-containing breed groups were similar. In the four breeds containing C/T and T/T ryrl genotypes, the additional copy of the ryrl T allele had a significantly positive effect on all measures of amount of lean meat with a negative effect on all meat quality scores (P < 0·001). Notably, the C/C and T/T ryrl genotypes in the NP and F2 breed groups differed significantly in all measures of amount of fat and lean; the C/T genotype was intermediate to the C/C and T/T genotypes in all traits with the C allele exhibiting partial dominance for these measures. It is concluded that within breed groups of similar genetic background, the ryrl genotype has positive effects on all measures of the amount of fat and lean, with associated negative effects on meat quality. The availability of the DNA-based test to identify the ryrl genotype allows pig breeders to take advantage of the beneficial traits or to eliminate the deleterious traits associated with this gene from their populations.

Keywords

carcass qualityperformancepigsryanodine receptorstress

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Type
Research Article
Information
Animal Science , Volume 60 , Issue 2 , April 1995 , pp. 249 - 257
Copyright
Copyright © British Society of Animal Science 1995

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