الكاتب: Multiple References

Details of 252 suspected cases of summer mastitis among dry cows and heifers in England in 1983 and 1984 were gathered by questionnaire . Samples of secretion were obtained from 242 of these cases and examined bacteriologically using both aerobic and anaerobic culture . The majority of cases (202) appeared to be summer mastitis, usually involving Corynebacterium pyogenes, and occurred predominantly in late gestation . Most cases affected only a single quarter, usually a front one and were more frequent in older, but not elderly cows . Only 3% of cases occurred within three weeks of cows receiving dry cow therapy, but 50% occurred within six weeks of therapy . At least 60% of cattle infected with summer mastitis were culled . Other types of udder infection were also found, particularly in pregnant cattle .