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Insecticidal ear tags

ga. prime

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Back on May 4th I put Python Magnum ear tags on all my cows. They did an excellent job. But now the flies are back big time. Should I re-tag with the Magnum Python tags or use one with a different active ingredient?
 

lazyhill

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We switch on a calendar year basis. If I have to reapply tags, I reapply the same type that year. Seems to work great for us. Just take the tags out when the flies are gone in the fall. I have heard that a weak tag builds fly tolerance to that type of chemical.
 

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