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<blockquote data-quote="Putangitangi" data-source="post: 355610" data-attributes="member: 5956"><p>In this country parasitic resistance to the chemicals in wormers is building quickly. The advice is to get an egg count done, apply whatever wormer you're using, wait a week to ten days and do the egg count again. If there's not been a 95% reduction in the eggs in the sample, your drench isn't working. Most of the problem is happening on feeder-calf farms, I believe, where there's a lot of resistance on chemicals to maintain production. Calves on cows don't need so much intervention.</p><p>I use a pour-on which covers immature and mature liver fluke (as well as the other internals), which has made the annual liver-fluke drenching vastly simpler! We didn't know we had it before doing a blood test several years ago and after drenching (oral only then) put an average 220lbs back on every cow! I was pretty new then and didn't realise how bad things were.</p></blockquote><p></p>
[QUOTE="Putangitangi, post: 355610, member: 5956"] In this country parasitic resistance to the chemicals in wormers is building quickly. The advice is to get an egg count done, apply whatever wormer you're using, wait a week to ten days and do the egg count again. If there's not been a 95% reduction in the eggs in the sample, your drench isn't working. Most of the problem is happening on feeder-calf farms, I believe, where there's a lot of resistance on chemicals to maintain production. Calves on cows don't need so much intervention. I use a pour-on which covers immature and mature liver fluke (as well as the other internals), which has made the annual liver-fluke drenching vastly simpler! We didn't know we had it before doing a blood test several years ago and after drenching (oral only then) put an average 220lbs back on every cow! I was pretty new then and didn't realise how bad things were. [/QUOTE]
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