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The relationship of pork longissimus muscle pH to mitochondrial respiratory activities, meat quality and muscle structure

Published online by Cambridge University Press:  23 September 2014

J. Popp ,
M. Wicke ,
G. Klein  and
C. Krischek
J. Popp
Affiliation:
Institute of Food Quality and Food Safety, University of Veterinary Medicine, Bischofsholer Damm 15, D-30173 Hannover, Germany
M. Wicke
Affiliation:
Department of Animal Sciences, Georg-August-University Goettingen, Albrecht-Thaer-Weg 3, D-37075 Goettingen, Germany
G. Klein
Affiliation:
Institute of Food Quality and Food Safety, University of Veterinary Medicine, Bischofsholer Damm 15, D-30173 Hannover, Germany
C. Krischek*
Affiliation:
Institute of Food Quality and Food Safety, University of Veterinary Medicine, Bischofsholer Damm 15, D-30173 Hannover, Germany
*
†E-mail: [email protected]
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Abstract

The way the pH falls post-slaughter has an impact on meat quality. Pork longissimus muscles (n=48) were sorted in fast- (FG) (n=15) and normal glycolysing (NG) (n=33) muscles according to the post-slaughter pH 45 min values (FG<6.0; NG>6.0). FG muscles (5.84±0.04) compared with NG muscles (6.27±0.04) were accompanied with higher temperature, electrical conductivity, lightness and yellowness, and reduced grill loss and shear force values (P<0.05), but there were no pH-dependent changes of the drip loss and redness results. FG muscles had higher (P<0.05) percentages of fast-twitch glycolytic and lower proportions of fast-twitch oxidative and slow-twitch oxidative (P<0.05) muscle fibres. The study confirms the relationship of pH value to meat quality and muscle fibre characteristics also showing that pH values have no impact on intrinsic mitochondrial respiratory function.

Keywords

pigpH valuemeat qualitymuscle structuremitochondrial respiratory activity
Type
Research Article
Information
animal , Volume 9 , Issue 2 , February 2015 , pp. 356 - 361
Copyright
© The Animal Consortium 2014 

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