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Phenotypic and Genetic Associations between Porcine Muscle Properties^{1, 2, 3,}

University of Wisconsin, Madison

Abstract

Eight porcine muscle properties were studied in 142 barrows of two breeds. Yorkshire barrows had significantly higher values for color and gross morphology score, 24-hr. pH, myoglobin concentration, fiber diameter and percent moisture, whereas the Durocs had significantly higher values for initial glycogen content and ether extract values. Expressible juice values were not significantly different between breeds. Phenotypic correlations between these traits were in general agreement with other reports. However, significantly different phenotypic correlations were found for breeds between initial glycogen content and color and gross morphology score, indicating that high initial glycogen values are not always associated with low color and gross morphology scores. The rate of anaerobic glycolysis, myoglobin concentrations and the muscle temperature-pH relationship at the onset of rigor mortis are also known to be major influencing factors on color and gross morphology of muscle. The correlations of fiber diameter with ether extract and with percent moisture were also significantly different between breeds. This may indicate breed differences relative to the site of lipid deposition in the muscle. All heritability estimates and the majority of the genetic correlations for these properties were nonsignificant, but had wide confidence limits due to the small number of observations. The limitations of these genetic estimates as they are influenced by sex, breed and strain have been discussed.

¹ This investigation was supported in part by Public Health Service Research Grant EF-81 (C7 and C8) from the Division of Environmental Engineering and Food Protection.

² Published with the approval of the Director of the Wisconsin Agricultural Experiment Station, Madison.

³ Department of Meat and Animal Science Paper No. 410 and Laboratory of Genetics Paper No. 1051.

⁴ Food Preservation Laboratory, C.S.I.R.O., Sydney, Australia.

⁵ Department of Animal Science, University of Minnesota,St. Paul.