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Had an interesting discussion with a retired dairy farmer from central valley of Cal.
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<blockquote data-quote="Lucky_P" data-source="post: 1709304" data-attributes="member: 12607"><p>While it's always been out there in the beef herds, there is no doubt in my mind that many beef seedstock operations introduced Johne's Disease into their herds when ET came into vogue in the late 1970s-early 1980s, when folks were sticking embryos into Holstein heifers and cull dairy cows. </p><p>25% or more of calves born to Johne's-infected cows may be infected <em>in utero</em>, and as those cows shed the bacterium in their colostrum, milk, and feces, calves are continually exposed while at their most vulnerable time. </p><p>Even if they were 'testing' for Johne's before using those early ET recip cows, the tests available back in that day were pretty poor, and even today's improved tests won't detect many infected cows until just before they start shedding the organism in her feces &/or breaks with clinical disease.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1709304, member: 12607"] While it's always been out there in the beef herds, there is no doubt in my mind that many beef seedstock operations introduced Johne's Disease into their herds when ET came into vogue in the late 1970s-early 1980s, when folks were sticking embryos into Holstein heifers and cull dairy cows. 25% or more of calves born to Johne's-infected cows may be infected [I]in utero[/I], and as those cows shed the bacterium in their colostrum, milk, and feces, calves are continually exposed while at their most vulnerable time. Even if they were 'testing' for Johne's before using those early ET recip cows, the tests available back in that day were pretty poor, and even today's improved tests won't detect many infected cows until just before they start shedding the organism in her feces &/or breaks with clinical disease. [/QUOTE]
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Had an interesting discussion with a retired dairy farmer from central valley of Cal.
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