Survey of the incidence and aetiology of mastitis on diary farms in England and Wales

A. J. Bradley, K. A. Leach, J. E. Breen, L. E. Green, M. J. Green

Research output: Contribution to journalArticlepeer-review

292 Citations (Scopus)


A survey of clinical and subclinical mastitis was carried out on 97 dairy farms in England and Wales, selected at random from members of a national milk recording scheme. The farmers were asked to collect aseptic milk samples from five consecutive cases of clinical mastitis and from five quarters with high somatic cell counts using a defined protocol, and they completed a questionnaire that included information on the cows sampled, the herd and the history of mastitis in the herd. The samples were collected throughout the year. The mean incidence of clinical mastitis was 47 cases per 100 cows per year (estimated from historic farm records) and 71 cases per 100 cows per year (estimated from the samples collected). Streptococcus uberis and Escherichia coli were isolated in pure culture from 23.5 per cent and 19.8 per cent, respectively, of the clinical samples; 26.5 per cent of the clinical samples produced no growth. The most common isolates from the samples with high cell counts were coagulase-negative staphylococci (15 per cent), S uberis (14 per cent) and Corynebacterium species (10 per cent). Staphylococcus aureus and coagulase-positive staphylococci together accounted for 10 per cent of the samples with high somatic cell counts; 39 per cent produced no bacterial growth.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalVeterinary Record
Issue number8
Publication statusPublished - 24 Feb 2007

ASJC Scopus subject areas

  • veterinary(all)


Dive into the research topics of 'Survey of the incidence and aetiology of mastitis on diary farms in England and Wales'. Together they form a unique fingerprint.

Cite this