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Complete versus selective dry cow therapy for mastitis control

R B Rindsig, R G Rodewald, A R Smith

    Journal of Dairy Science
    |October 1, 1978
    PubMed
    Summary
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    Selective dry cow therapy effectively eliminated existing mastitis infections, comparable to complete therapy. However, complete dry cow therapy showed a lower incidence of new infections during the dry period, making it preferable when preventing new infections is critical.

    Area of Science:

    • Veterinary Medicine
    • Animal Health
    • Bovine Mastitis

    Background:

    • Mastitis is a significant concern in dairy cows, impacting animal health and milk production.
    • Dry cow period management is crucial for preventing and treating intramammary infections.

    Purpose of the Study:

    • To compare the efficacy of complete dry cow therapy versus selective dry cow therapy in eliminating existing infections and preventing new ones.
    • To evaluate the incidence of mastitis post-dry period for both treatment strategies.

    Main Methods:

    • Two hundred thirty-two cows were allocated to either complete or selective dry cow therapy groups.
    • Therapy involved intramammary infusion of procaine penicillin G and dihydrostreptomycin.
    • Selective therapy was based on mastitis history, California Mastitis Test scores, and milk cell counts.

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  • A 1% iodophor teat dip was used universally.

    • Main Results:

    • Both complete and selective therapies eliminated existing Staphylococcus aureus, Streptococcus agalactiae, other streptococci, and gram-negative rod infections in over 85% of quarters.
    • New infections occurred in 3.1% of quarters with complete therapy and 6.5% with selective therapy.
    • The incidence of mastitis post-dry period was lower with complete therapy (4.6%) compared to selective therapy (7.8%).

    Conclusions:

    • Selective dry cow therapy is as effective as complete therapy in eliminating existing intramammary infections.
    • Complete dry cow therapy demonstrates a lower incidence of new infections during the dry period.
    • Complete therapy is recommended when the prevention of new dry period infections is a primary concern.