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why raise your own replacements . . . .
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<blockquote data-quote="Lucky_P" data-source="post: 886712" data-attributes="member: 12607"><p>MSG makes a good point. It's taken me 17 years to get to 70 head of females, re- starting with 5 registered cows I retained when I went back to grad school. Haven't purchased anything but a bull and some semen. No diseases that I didn't already have purchased in the process.</p><p>We've retained probably 80% of heifers along the way - only selling if they were REALLY crappy or a disposition problem. I know what I have and what they are - and I'm pretty much at carrying capacity now. Have culled heavily on disposition the last 3 years or so and all but one of the crazies are gone, now culling hard on productivity - if they're not producing a good calf from here on out, or don't fit our needs, they're gone...</p><p></p><p>Johne's is a tough deal - and the cows that 9259's friend purchased may have tested negative at the time they sold, but if she came out of a herd with known Johne's infection - or was an embryo implanted into a Johne's-infected recip - the sellers may (or may not have) had an idea that she had a good chance of becoming a clinical Johne's case down the road.</p><p>Unfortunately, many of these Johne's-infected cows will not have a diagnostic titer until just about the time they start shedding the organism in their feces and become 'clinical' - which is often about the time they calve as a 4 or 5-yr old. </p><p>I'm convinced that a significant number of our purebred herds have 'acquired' Johne's Disease as a consequence of buying dairy cows/heifers for use as embryo recipients, or purchasing similar pregnant recips carrying embryos. </p><p>We know that about 25% of calves born to Johne's-infected cows become infected in utero, and due to exposure to the organism in milk and manure, beef calves born to Johne's-infected dams have a 10X greater likelihood of contracting the infection than calves in the same herd, born to non-infected dams.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 886712, member: 12607"] MSG makes a good point. It's taken me 17 years to get to 70 head of females, re- starting with 5 registered cows I retained when I went back to grad school. Haven't purchased anything but a bull and some semen. No diseases that I didn't already have purchased in the process. We've retained probably 80% of heifers along the way - only selling if they were REALLY crappy or a disposition problem. I know what I have and what they are - and I'm pretty much at carrying capacity now. Have culled heavily on disposition the last 3 years or so and all but one of the crazies are gone, now culling hard on productivity - if they're not producing a good calf from here on out, or don't fit our needs, they're gone... Johne's is a tough deal - and the cows that 9259's friend purchased may have tested negative at the time they sold, but if she came out of a herd with known Johne's infection - or was an embryo implanted into a Johne's-infected recip - the sellers may (or may not have) had an idea that she had a good chance of becoming a clinical Johne's case down the road. Unfortunately, many of these Johne's-infected cows will not have a diagnostic titer until just about the time they start shedding the organism in their feces and become 'clinical' - which is often about the time they calve as a 4 or 5-yr old. I'm convinced that a significant number of our purebred herds have 'acquired' Johne's Disease as a consequence of buying dairy cows/heifers for use as embryo recipients, or purchasing similar pregnant recips carrying embryos. We know that about 25% of calves born to Johne's-infected cows become infected in utero, and due to exposure to the organism in milk and manure, beef calves born to Johne's-infected dams have a 10X greater likelihood of contracting the infection than calves in the same herd, born to non-infected dams. [/QUOTE]
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