الفهرس 
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Abstract
Beef quality of a total 35 carcasses, slaughtered and dressed at old-fashioned Mansoura abattoir, was evaluated by making both general bacteriological analyses and pHu estimation of such carcasses. Plates of aerobic plate count agar medium exhibited the occurrence of aerobic mesophilic bacteria in deep tissues of all samples [25 (100%) for each samples’ type] excised from 25 unrested beef animals, slaughtered and dressed at abattoir without previous lairaging, with ranges (minimum–maximum) and means±standard errors of 102–3.7×104 and 3.4×103±1.5×103 organisms/g of flexor carpi radialis muscle, 102–2×105 and 4.6×104±104 organisms/g of prescapular lymph node, 4×102–4.5×105 and 9.5×104±2.3×104 organisms/g of mesenteric lymph node, alongside 3×102–2.9×105 and 4.7×104±1.3×104 organisms/g of liver; meanwhile lesser occurrence and intensities of Enterobacteriaceae organisms were recorded in the same aforementioned samples, as plates of violet red bile glucose medium emphasized the presence of such bacteria in 3 (12%) samples of flexor carpi radialis muscle by intensities of 0–47 and 4.68±1.23 organisms/g, in 1 (4%) samples of prescapular lymph node by populations of 0–100 and 4±1.31 organisms/g, in 5 (20%) samples of mesenteric lymph node by counts of 0–100 and 92±27.1 organisms/g, besides in 10 (40%) samples of liver by numbers of 0–100 and 93.2±23 organisms/g. Similar bacteriological techniques were also applied on the same tissues’ types excised from additional 10 beef carcasses, slaughtered and dressed at the same abattoir after lairaging their animals for 4 h, and revealed the presence of aerobic mesophiles in 7 (70%) samples of flexor carpi radialis muscle by populations of 0–7.5×102 and 2.6×102±102 organisms/g, whilst this presence was detected in deep tissues of all the remaining samples [10 (100%) each] by intensities of 5×10–4×102 and 1.8×102±0.4×102 organisms/g of prescapular lymph node, 1.5×102–1.7×103 and 8.9×102±2.1×102 organisms/g of mesenteric lymph node besides 5×10–1.2×103 and 5×102±1.3×102 organisms/g of liver; whereas the Enterobacteriaceae organisms cannot be recovered from deep tissues of flexor carpi radialis muscle or prescapular lymph node (0% each), of surveyed carcasses of 4 h-rested animals but they were only detected in 2 (20%) samples of mesenteric lymph node by counts of 0–75 and 12.5±3 organisms/g alongside in 1 (10%) samples of liver, excised from the same carcasses, by 0–200 and 20±6 organisms/g. Additionally, an electronic temperature-modified pH meter (Model: pH-206, Lutron Electronic, Australia) estimated the ranges (minimum–maximum) and mean values±standard errors of pHu levels in diaphragm muscle samples, 24 h after slaughter, as 5.70–6.30 and 5.94±0.04 for those samples excised from the carcasses of unrested beef animals in additional to 5.48–6.18 and 5.80±0.07 for those beef samples taken from the carcasses of 4 h-rested animals. Seeing the detailed pHu readings of both two carcasses’ categories, (derived from unrested and rested animals) reveal that 16 (64%) and 8 (32%) of beef samples excised from the former carcasses’ category besides 4 (40%) and 1 (10%) of beef samples taken from the latter carcasses’ category possessed pHu levels of >5.8 and >6, respectively