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Mastitis in a large, zero-grazed dairy herd.

W B Faull, J R Walton, A J Bramley

    The Veterinary Record
    |October 29, 1983
    PubMed
    Summary

    Escherichia coli and Streptococcus uberis caused significant mastitis in a zero-grazed herd despite controls for other bacteria. Improved hygiene and environmental management are crucial for reducing clinical mastitis cases.

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    Area of Science:

    • Veterinary Medicine
    • Animal Health
    • Bovine Mastitis Research

    Background:

    • A large, zero-grazed dairy herd experienced persistent mastitis issues over 3.5 years.
    • Standard dry cow therapy and teat dipping controlled staphylococci but not major pathogens.

    Purpose of the Study:

    • To investigate the causes and incidence of mastitis in a zero-grazed herd.
    • To evaluate the effectiveness of current management practices against specific mastitis pathogens.

    Main Methods:

    • Longitudinal study over 3.5 years in a herd of ~400 cows.
    • Monitoring of clinical mastitis cases, causative agents (E. coli, S. uberis), and treatment outcomes.
    • Assessment of environmental factors including housing cleanliness and milking hygiene.

    Main Results:

    • Over 1800 clinical mastitis cases occurred, with E. coli (32%) and S. uberis (25%) as primary pathogens.
    • Penicillin and streptomycin effectively treated 75% of E. coli cases, with low systemic involvement (8%).
    • Mastitis incidence peaked in spring/summer, correlating with increased housing dirtiness; bedding material changes had no effect.

    Conclusions:

    • Escherichia coli and Streptococcus uberis pose significant challenges in zero-grazed herds, requiring targeted control strategies.
    • Environmental hygiene in housing and milking parlors is critical for mastitis prevention.
    • Further research into novel management interventions is needed to reduce pathogen transmission.

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