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<blockquote data-quote="Lucky_P" data-source="post: 1759753" data-attributes="member: 12607"><p>'Rotation' should not mean switching to a different class of anthelminthics every time you deworm... Veterinarians and Extension livestock specialists of my generation made those sorts of recommendations... and we were wrong!</p><p></p><p>Read the following article from BEEF magazine. </p><p>Ray Kaplan has been at the forefront of trying to manage/reduce anthelminthic resistance. </p><p> <a href="https://www.beefmagazine.com/animal-health/five-ideas-parasite-refugia" target="_blank">https://www.beefmagazine.com/animal-health/five-ideas-parasite-refugia</a> </p><p></p><p>I'll go farther than his recommendation to leave at least 10% of herd 'untreated' (I imagine he's had to temper that recommendation to mollify 'advertisers in these magazines.). I recommend not deworming adult cows. At all. By the time they are 3-4 yrs of age, they should have developed resistance/resilience and have very few, if any, 'worms'., and the few they have are important, with regard to serving as a source of refugia. </p><p></p><p>I haven't seen an adult cow die due to gastrointestinal nematode parasitism ('worms!') in over 30 years. The macrocyclic lactones (ivermectin class) have been used so widely in the USA that Ostertagia is mostly a non-issue anymore... it's all but extinct on many premises.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1759753, member: 12607"] 'Rotation' should not mean switching to a different class of anthelminthics every time you deworm... Veterinarians and Extension livestock specialists of my generation made those sorts of recommendations... and we were wrong! Read the following article from BEEF magazine. Ray Kaplan has been at the forefront of trying to manage/reduce anthelminthic resistance. [URL]https://www.beefmagazine.com/animal-health/five-ideas-parasite-refugia[/URL] I'll go farther than his recommendation to leave at least 10% of herd 'untreated' (I imagine he's had to temper that recommendation to mollify 'advertisers in these magazines.). I recommend not deworming adult cows. At all. By the time they are 3-4 yrs of age, they should have developed resistance/resilience and have very few, if any, 'worms'., and the few they have are important, with regard to serving as a source of refugia. I haven't seen an adult cow die due to gastrointestinal nematode parasitism ('worms!') in over 30 years. The macrocyclic lactones (ivermectin class) have been used so widely in the USA that Ostertagia is mostly a non-issue anymore... it's all but extinct on many premises. [/QUOTE]
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