Animal Production Science Animal Production Science Society
Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Carcass lean-yield effects on the fatty acid and amino acid composition of Duroc pork and its technological quality after vacuum-aging

J. Álvarez-Rodríguez A , R. Ros-Freixedes B , S. Gol A , E. Henríquez-Rodríguez A , R. N. Pena A , L. Bosch C , J. Estany A , F. Vilaró D and M. Tor A E
+ Author Affiliations
- Author Affiliations

A Department of Animal Science, University of Lleida-Agrotecnio Centre, Universitat de Lleida, Av. Rovira Roure 191, CP 25198, Spain.

B Present address: The Roslin Institute and Royal (Dick) School of Veterinary Studies, The University of Edinburgh, United Kingdom.

C Department of Chemical and Agricultural Engineering and Agrifood Technology, Universitat de Girona, Spain.

D Scientific-Technical Services DATCEM, Universitat de Lleida, Spain.

E Corresponding author. Email: mtor@ca.udl.cat

Animal Production Science - https://doi.org/10.1071/AN17070
Submitted: 7 February 2017  Accepted: 30 June 2017   Published online: 28 September 2017

Abstract

Eighty purebred Duroc castrated male pigs slaughtered at 210 days of age were used to evaluate the effect of lean yield (European Union carcass grading based on lean content; or R, O and P classes) on the fatty acid and amino acid composition of raw pork (Day 1 post-mortem), and technological meat quality after vacuum aging up to 4, 6 and 8 days. A strong relationship between slaughter weight and carcass lean-yield was observed. Carcasses graded as having a lower lean yield were fatter with higher intramuscular fat concentration, and differences in proportions of fatty acids with increased monounsaturated fatty acid and decreased polyunsaturated fatty acid percentage, but without adverse effect on ultimate pH, drip loss or colour attributes. There were no effects of carcass lean-yield on amino acid composition of raw pork, with valine being the limiting amino acid relative to lysine by ~30–35%. Vacuum aging did not reduce the shear force of raw pork, which may not be indicative of cooked pork response. The lipid oxidation had an inverse relationship with the polyunsaturated fatty acid content of each pork class, and it did not increase due to vacuum aging up to 8 days. Meat fatness did not affect its amino acid balance and technological quality (colour, drip loss, shear force and lipid stability) but modified intramuscular fat composition.

Additional keywords: intramuscular fat, nutritive evaluation, pigs.


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