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Double Deworming after wet season
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<blockquote data-quote="Lucky_P" data-source="post: 1587313" data-attributes="member: 12607"><p>'Rotating' dewormers has been misinterpreted and misused, and many of my veterinary colleagues are to blame for giving erroneous information to their clients regarding this practice. </p><p>Using a different dewormer or class of dewormers every time you deworm is a recipe for speeding down the road to selecting for a population of worms that are resistant to everything; ask the goat people. Better to stick with one class and use it until it is no longer effective, then switch. </p><p>And... with the avermectins and the benzimidazoles(white/drench)... once you've selected for a resistant population... it's forever. It appears, however, that with the imidazothiazoles(levamisol, etc.), if you stop using them for 10 years or so, the level of resistance genes in the population abates. </p><p></p><p>That said, the combination of a macrocyclic lactone(ivermectin, dectomax, cydectin) and a benzimidazole(panacur/safeguard, synanthic, valbazen) has shown, in trials with stockers and weanling/yearling heifers, to be as effective - and less expensive - than LongRange. I've done the combo with calves and weanling heifers, but not cows. </p><p></p><p>I'm still of the opinion that adult cows rarely, if ever, NEED deworming. Yes, trials have suggested increased weaning weights in calves of dewormed cows, but I only deworm calves, yearling heifers and first-calf heifers nursing a calf. Mature cows... can't recall the last time I dewormed one. </p><p>I haven't seen 'worms'(with the exception of liver flukes) kill a mature cow...or even have a significant health impact on one... in over 25 years. Used to see Type II ostertagiasis causing weight loss and diarrhea...to the point that they looked like a Johne's Disease cow... but the ML/avermectin-type dewormers have mostly eliminated that issue... same as with Strongylus vulgaris in horses... it's largely 'extinct' on most premises, due to frequent use of the ML/avermectin type dewormers.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1587313, member: 12607"] 'Rotating' dewormers has been misinterpreted and misused, and many of my veterinary colleagues are to blame for giving erroneous information to their clients regarding this practice. Using a different dewormer or class of dewormers every time you deworm is a recipe for speeding down the road to selecting for a population of worms that are resistant to everything; ask the goat people. Better to stick with one class and use it until it is no longer effective, then switch. And... with the avermectins and the benzimidazoles(white/drench)... once you've selected for a resistant population... it's forever. It appears, however, that with the imidazothiazoles(levamisol, etc.), if you stop using them for 10 years or so, the level of resistance genes in the population abates. That said, the combination of a macrocyclic lactone(ivermectin, dectomax, cydectin) and a benzimidazole(panacur/safeguard, synanthic, valbazen) has shown, in trials with stockers and weanling/yearling heifers, to be as effective - and less expensive - than LongRange. I've done the combo with calves and weanling heifers, but not cows. I'm still of the opinion that adult cows rarely, if ever, NEED deworming. Yes, trials have suggested increased weaning weights in calves of dewormed cows, but I only deworm calves, yearling heifers and first-calf heifers nursing a calf. Mature cows... can't recall the last time I dewormed one. I haven't seen 'worms'(with the exception of liver flukes) kill a mature cow...or even have a significant health impact on one... in over 25 years. Used to see Type II ostertagiasis causing weight loss and diarrhea...to the point that they looked like a Johne's Disease cow... but the ML/avermectin-type dewormers have mostly eliminated that issue... same as with Strongylus vulgaris in horses... it's largely 'extinct' on most premises, due to frequent use of the ML/avermectin type dewormers. [/QUOTE]
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