MEDLINE Journals

    Decreased growth of Streptococcus uberis in milk from mammary glands of cows challenged with the same mastitis pathogen.

    Authors
    Fang W, Luther DA, Almeida RA, et al. 
    Source
    Zentralbl Veterinarmed B 1998 Nov; 45(9) :539-49.
    Abstract

    Milk samples from mammary glands challenged with Streptococcus uberis and from unchallenged mammary glands were selected for analyses of bacterial growth, antibody response, and lactoperoxidase activity. All challenged mammary glands became infected with isolation of S. uberis and elevated somatic cell counts in milk during the first week after challenge. In vitro growth of the homologous challenge strain and a heterologous strain of S. uberis was significantly lower in milk from challenged mammary glands than in milk from control mammary glands at 3, 5, and 7 days after challenge. Removal of casein significantly reduced bacterial growth. In general, antibodies specific to S. uberis started to increase at day 3 post-challenge and were higher in milk from challenged mammary glands than in milk from control mammary glands. There was also a marked increase in total IgG in milk from challenged mammary glands. Growth of S. uberis increased following heat treatment at 56 degrees C of pooled milk or whey samples from challenged mammary glands. Growth of S. uberis correlated negatively with the specific antibody response to the bacteria (P < 0.001). Lactoperoxidase activity varied among cows and among different samples over time and did not appear to contribute to decreased growth of S. uberis. These results suggest that decreased growth of S. uberis in milk from challenged mammary glands in comparison to milk from control mammary glands could result from the interaction of antibodies with complement components.

    Mesh
    Animals
    Cattle
    Cattle Diseases
    Female
    Immunoglobulin G
    Mammary Glands, Animal
    Mastitis, Bovine
    Milk
    Streptococcal Infections
    Streptococcus
    Language

    eng

    Pub Type(s)
    Journal Article Research Support, Non-U.S. Gov't
    PubMed ID

    9852769

    Content Manager
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