Effect of lean meat proportion on the chemical composition of pork
2008
Okrouhla, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Stupka, R.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Citek, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Sprysl, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Trnka, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky | Kluzakova, E.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Specialni Zootechniky
The objective of this work was to verify the effect of the lean meat proportion (LMP) on the chemical composition of the meaty parts (loin and ham) of pork. A total of 116 hybrid pigs commonly used in the Czech Republic were fattened for this purpose. The pigs were divided according to the lean meat proportion criterion into 3 groups, i.e. more than 60.0%, 55.0-59.9% and 50.0-54.9%. Representative muscle samples were taken from the right halves of these pigs. They were then homogenised and submitted to chemical analysis. The values of water content, intramuscular fat (IMF), crude proteins, and ash matter were as follows: in the loin: 72.50-72.80%, 1.56-1.96%, 23.20-23.40%, and 1.37-1.40%, respectively, in the ham: 70.43-71.59%, 3.52-4.26%, 21.67-21.95%, and 1.42-1.56%, respectively. The higher the LMP, the lower the IMF content. The ash content increased with increasing LMP. The analyses of amino acid composition of musculus longissimus lumborum et thoracis (MLLT) and musculus semimembranosus (MS) showed that when the LMP increased, threonine, isoleucine, lysine, aspartic acid, serine, and proline concentrations in MLLT decreased, whereas valine, isoleucine, phenylalanine, lysine, serine, proline, and glycine conc. in MS increased. The values of IMF in MLLT, water content, IMF, ash matter, threonine, valine, phenylalanine, lysine, aspartic acid, serine, glycine, and alanine in MS differed significantly among the groups studied.
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