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Discussion in 'Emergencies / Diseases / Injuries and Cures' started by Glenda L Heywood, Apr 14, 2009.

  1. Glenda L Heywood

    Glenda L Heywood Songster

    Apr 11, 2009
    Birds building resistance to medication
    Glenda L Heywood and Kim J Theodore

    Because so many people feel it is good to medicate to ward off disease, as it is more harm to the chickens than good I emailed Kim J Theodore on this subject and she had some very good thoughts you will get information from

    GLH ask:
    Kim just a question here
    What does it mean that some meds encourage resistance?

    KJT answers
    It means that some antibiotics either never were or
    are no longer effective at prescribed doses for
    certain things (example is Tylan for MG, airsacculitis
    or some tetracyclines for Coryza) and as a result,
    treatment with these drugs can cause the bacteria to
    become even more resistant as the medication is used
    over and over.

    Also, if a medication IS effective
    against a specific bacteria, and the full dose is not
    given because the bird seems fine after half of the
    duration of treatment and the person stops treatment
    as a result, then the bacteria can begin to build some
    resistance at that point.

    When the infection comes
    back, it could take a longer period of treatment than
    the first to rid the bird of the bacteria completely.
    But since the average person would not know this and
    would simply treat for the same duration the second
    time, you set up a cycle that encourages the bacteria
    to become resistant.

    GLH ask:
    Why would good show birds not build a resistance?

    KJT answered
    Many good show birds do build disease resistance. However,
    as more and more fanciers are breeding for smaller and
    more refined birds, the birds can also become weaker
    as a result. Breeding smaller and smaller

    Call Ducks
    is a very good example of this - most of the really
    tiny ones cannot reproduce. Also remember that some
    diseases (viruses primarily) are so horrific and
    rarely present, that no resistance can be built since
    even one exposure to the disease will cause death.
    (END is a good example.)

    GLH ask
    And why does building a line to disease resistance not
    KJT answered
    It does work in many cases. A friend of mine is
    a good example of this at work. I've heard it said
    that if one of his birds starts to cough, the other
    birds hide it from him when he comes in to
    feed...(LOL) ..

    .Anyway, he simply culls any bird that
    shows any signs of illness and he feels that this plan
    works very well for him.

    I don't dispute that.
    However, I also feel , that there are some illnesses
    that your bird could never
    build natural resistance to because they would never
    be exposed to them, but they are treatable. In other
    words, even the healthiest of birds would become ill
    but doesn't have to die because the illness has a
    simple treatment for full recovery. In those cases,
    culling for resistance is unfair to the birds. Clear
    as mud?

    Thanks Kim for the reply

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