Relationship of glycogen and lactate concentrations as a pork quality indicator
| Autor: | Andrzej Zybert, E. Krzecio-Nieczyporuk, Halina Sieczkowska, Katarzyna Antosik, K. Tarczynski |
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| Rok vydání: | 2020 |
| Předmět: |
Muscle tissue
Muscle metabolism Lactate concentration Glycogen glycolytic resources Chemistry Metabolite 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science chemistry.chemical_compound drip loss pork colour medicine.anatomical_structure Animal science post-mortem muscle metabolism medicine Animal Science and Zoology Glycolysis Longissimus Lumborum |
| Zdroj: | South African Journal of Animal Science, Volume: 50, Issue: 1, Pages: 26-37, Published: 2020 |
| ISSN: | 2221-4062 0375-1589 |
| DOI: | 10.4314/sajas.v50i1.4 |
| Popis: | Muscle metabolites greatly determine pork quality. However, precise threshold values which indicate its deterioration or improvement are not fully known. This study aimed to determine the influences of pork Longissimus lumborum (LL) glycogen and lactate concentrations measured at 45 min post mortem on pH, colour (L*a*b*) and drip loss (DL) measured during 144 hours post mortem in order to prescribe appropriate threshold values. The investigation used 30 gilts and 30 barrows being fattened for slaughter. After slaughter, the carcasses were assigned to groups based on the observed levels of glycogen and lactate: low GlyL with glycogen ≤35 μmol/g, GlyM with glycogen between 35 and 55 μmol/g, GlyH with glycogen >55 μmol/g; LacL with lactate ≤40 μmol/g and LacH with lactate >40 μmol/g. Lower muscle pH was noted up to 24 h post mortem in the LacH group compared to LacL (P ≤0.01). 24 h post mortem higher pH was found in GlyL than in GlyM and GlyH (P ≤0.01), which were similar. Similarly no statistical differences were noted between The GlyM and GlyH groups were also similar in L*, DL96 and DL144, with lower values found for GlyL (P ≤0.01). Compared to LacH, LacL had lower L*, DL48, DL96 and DL144 (P ≤0.01) and higher a* and b* values. Muscle pH, drip loss, L* and a* values were more affected by lactate concentration if the glycogen concentration ≥35 μmol/g muscle tissue. Thus, metabolite concentration may be a useful and valuable indicator of pork quality. Keywords: drip loss, glycolytic resources, pork colour, post-mortem muscle metabolism |
| Databáze: | OpenAIRE |
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