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<blockquote data-quote="Lucky_P" data-source="post: 1638626" data-attributes="member: 12607"><p>I haven't dewormed anything older than a first-calf heifer nursing her first calf in decades. </p><p>Have not seen a cow(at the vet. diagnostic lab, where I was a diagnostic pathologist for 25 years) that died from 'worms' - other than a couple of imported yearlings from TX with liver flukes - since the early 1990s.</p><p>I'm firmly in the camp of doubting that there is any economic benefit to deworming adult cows, much less doing it twice yearly. If you're deworming the entire herd, you're creating problems that may come back to bite you down the road, as doing so kills all 'susceptible' worms, leaving only 'resistant' worms to reproduce and give rise to subsequent generations of parasites.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1638626, member: 12607"] I haven't dewormed anything older than a first-calf heifer nursing her first calf in decades. Have not seen a cow(at the vet. diagnostic lab, where I was a diagnostic pathologist for 25 years) that died from 'worms' - other than a couple of imported yearlings from TX with liver flukes - since the early 1990s. I'm firmly in the camp of doubting that there is any economic benefit to deworming adult cows, much less doing it twice yearly. If you're deworming the entire herd, you're creating problems that may come back to bite you down the road, as doing so kills all 'susceptible' worms, leaving only 'resistant' worms to reproduce and give rise to subsequent generations of parasites. [/QUOTE]
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