Thirty minutes after slaughtering, the pH is measured in the
Longissimus thoracis (pH30LT), between the second last and the last rib.
The site along the slaughter line which corresponds to 30 min after
slaughter was determined for each slaughter house. At the start of the
pH30LT measurements and after every 20 measurements the pH electrode
was treated with a cleaning solution for oils (HI7077, Hanna
Instruments, Temse, Belgium) and a cleaning solution for proteins(HI7073L, Hanna Instruments, Temse, Belgium). Further the pHindicator was checked by using two standard solutions of pH 7 and pH 4. The electrode was recalibrated if the pH30LT had a deviation of the calibrated pH-value of more than 0.01 units. All measurements were performed by the same person, using the same type of pHelectrode. The above-described procedure is advised by Hanna Instruments and Van de Perre et al. (2010) recommended this method as a reference method for accurate pH measurements. When the pH was less than 6.0 30 min after sticking, pork is defined as a risk for PSE meat