Contribution to laboratory examinations of milk samples from herds with mastitis problems
Klima, H.; Stojanowic, V.
Deutsche Tierärztliche Wochenschrift 84(9): 337-340
1977
ISSN/ISBN: 0341-6593 PMID: 336343 Document Number: 118705
Cytological and bacteriological studies were performed over six years on milk samples (total 54 739; mean of 9123 samples a year) from farms with a history of mastitis (between 400 and 900 a year). The mean number of cases per year where no specific bacterium was implicated in mastitis was 1563 (range 1060-2234); the mean number of cases per year positively identified as bacteriologically induced mastitis was 836 (range 318-2044). The annual variation (1971-76) in unclassified streptococcal strains resistant to penicillin was: 12, 2.6, 3.7, 3.4, 3.1 and 10.3%, and results for chloramphenicol were: 7.1, 9.8, 6.7, 13.3, 12.9, and 13.5%. The resistance rate of staphylococcal strains to penicillin was higher: 31, 27.4, 28.9, 29.4, 38.1 and 20.6%, and results for chloramphenicol were: 28.9, 29.7, 15.8, 18, 13 and 14.9%. It was concluded that mastitis problems originated more from poor milking techniques than from specific bacteria, of which staphylococcal strains are the most pathogenic.