Comparison of different pH measurement methods in meat.

The accuracy of portable pH meters and the nitrazine yellow method was compared with the reference method by determining the pH of 74 beef and 96 pork muscles. The pH was measured directly from the muscle. The results showed statistically significant differences (p less than 0.

The effect of the pH of meat on the boiling test.

The effect of the pH on the boiling test was studied in 68 beef and 108 pork muscles. The pH had a significant effect on the sensory scores obtained from the boiling test. The effect was particularly pronounced in the odour of meat.

Determination of pH in meat.

The pH of 80 beef and 120 pork muscles was determined electrometrically using different electrode systems and different presentations of samples; that is, directly from the muscle, from a meat-water mixture and from a meat homogenate. The results showed statistically significant differences (p < 0·001). Differences between electrodes appear to be greater than the differences due to the different presentations of the meat samples.

Comparison of different agar diffusion methods for the detection of residues in the kidneys of pigs treated with antimicrobial drugs.

Residue analyses of the kidneys of twenty-six pigs treated with various antimicrobial drugs 20 h before slaughter and of eleven untreated pigs were performed. The effects of storage temperature of the kidneys, and of sampling location, on the residue analysis were also studied. No method alone was sufficient for the detection of residues.

Comparison of different agar diffusion methods for the detection of antimicrobial residues in slaughter animals.

The different agar diffusion methods were compared using antibiotic and sulphonamide-impregnated filter-paper discs and the kidneys of healthy and emergency-slaughtered pigs and cows after slaughter. No method used seemed to be sensitive to all antimicrobial drugs preimpregnated onto discs. Tetracycline yielded a greater zone of inhibition at pH 6 than at pH 8 and aminoglycosides, erythromycin, polymyxin B and lin cornycin at pH 8 than at pH 6.

The influence of mastitis, local peritonitis and distomatosis on the lymphocytic picture of bovine blood.

The authors have studied hematologically and patho-anatomically 232 slaughter cattle, of which 89 had distomatosis, 15 mastitis and 23 local peritonitis. None was observed to have lymphocytosis. The statistical comparison between the age groups and between diseased and healthy animals did not reveal any significant differences in the total count of leukocytes or in the relative number of lymphocytes.