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<blockquote data-quote="Anonymous" data-source="post: 10221"><p>The reason for this is that penicillins are bacteriocidal (kill bacteria) and tetracyclines are bacteriostatic (stop them from dividing) so frankly, they stop each other from working properly. Many scour pills are NOT tetracyclines. Sulfas, neomycin etc are much more common here. Just on a tangent, I rarely use tetracyclines on young (esp heifer)calves, since it causes enamel hypoplasia, which will cause "broken mouth" later in life from the permanent, unerupted teeth being damaged during formation. Sulfas are causing a problem in the food chain, with many rendering (dead stock) plants refusing any carcass with sulfa residues, so this use as a scour tablet is not universal. I live in Canada, so this may not be pertinent in your area.</p></blockquote><p></p>
[QUOTE="Anonymous, post: 10221"] The reason for this is that penicillins are bacteriocidal (kill bacteria) and tetracyclines are bacteriostatic (stop them from dividing) so frankly, they stop each other from working properly. Many scour pills are NOT tetracyclines. Sulfas, neomycin etc are much more common here. Just on a tangent, I rarely use tetracyclines on young (esp heifer)calves, since it causes enamel hypoplasia, which will cause "broken mouth" later in life from the permanent, unerupted teeth being damaged during formation. Sulfas are causing a problem in the food chain, with many rendering (dead stock) plants refusing any carcass with sulfa residues, so this use as a scour tablet is not universal. I live in Canada, so this may not be pertinent in your area. [/QUOTE]
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