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Livestock
Livestock & Forage
Johnes dilemma
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<blockquote data-quote="choochter" data-source="post: 6181980" data-attributes="member: 85"><p>Two tales to tell…</p><p></p><p>Tale 1</p><p>The first cow I ever bought came with a lovely heifer calf at foot. That heifer calf tested positive when in calf for the second time and was culled after rearing the calf. I still have that first cow, now aged 17 and in calf with her 14th calf. Presumably, the heifer calf must’ve picked up Johnes from some other cow’s infected dung before I bought them</p><p></p><p>So, by that reckoning, CowB should be fine.</p><p></p><p>Tale 2</p><p>I bought 2 heifers a couple of years ago, quarantined them and tested for Johnes. One tested low antibody positive for Johnes and negative in the dung. We waited a couple of months and retested the heifer but this time took two blood samples and sent them to two different labs.</p><p></p><p>The result on the second test was antibody negative and dung negative from the original lab and low antibody positive from the second lab.</p><p></p><p>So, that was unhelpfully unclear to say the least.</p><p></p><p>Therefore, I think that if CowA’s result was high then she probably has it and should be culled. And in that case keeping her daughters might be too big a risk. If CowA’s result is a low positive, then I’d be keeping her and retesting in a year.</p></blockquote><p></p>
[QUOTE="choochter, post: 6181980, member: 85"] Two tales to tell… Tale 1 The first cow I ever bought came with a lovely heifer calf at foot. That heifer calf tested positive when in calf for the second time and was culled after rearing the calf. I still have that first cow, now aged 17 and in calf with her 14th calf. Presumably, the heifer calf must’ve picked up Johnes from some other cow’s infected dung before I bought them So, by that reckoning, CowB should be fine. Tale 2 I bought 2 heifers a couple of years ago, quarantined them and tested for Johnes. One tested low antibody positive for Johnes and negative in the dung. We waited a couple of months and retested the heifer but this time took two blood samples and sent them to two different labs. The result on the second test was antibody negative and dung negative from the original lab and low antibody positive from the second lab. So, that was unhelpfully unclear to say the least. Therefore, I think that if CowA’s result was high then she probably has it and should be culled. And in that case keeping her daughters might be too big a risk. If CowA’s result is a low positive, then I’d be keeping her and retesting in a year. [/QUOTE]
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