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Black leg....a doozer of a question
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<blockquote data-quote="milkmaid" data-source="post: 695928" data-attributes="member: 852"><p>I don't know, but it's an interesting question you bring up. In regards to blackleg, per the example you gave (edit: looks like I was looking at the one msscamp gave), that would just be keeping a group of cattle around that have immunity to blackleg because of exposure. They may have good immune systems because you breed for a hearty group of cattle, but each calf is still born without any antibodies to the disease and must still acquire them from colostrum and/or exposure (natural or vaccine-induced). Without colostrum from cattle in that group, or exposure, the calves would still be succeptible to blackleg.</p><p></p><p>In the case of HIV, I am told there are people that are resistant, mainly because some of their white blood cells (what HIV attacks) do not function in the way that most of humankind's WBCs do (what we'd consider normal), and HIV cannot enter. Were we to breed cattle that blackleg could not infect, we'd have to create something that wasn't "normal" and - offhand I don't know the route of infection - it may or may not be possible to create cattle that could not be infected by the blackleg bacteria.</p></blockquote><p></p>
[QUOTE="milkmaid, post: 695928, member: 852"] I don't know, but it's an interesting question you bring up. In regards to blackleg, per the example you gave (edit: looks like I was looking at the one msscamp gave), that would just be keeping a group of cattle around that have immunity to blackleg because of exposure. They may have good immune systems because you breed for a hearty group of cattle, but each calf is still born without any antibodies to the disease and must still acquire them from colostrum and/or exposure (natural or vaccine-induced). Without colostrum from cattle in that group, or exposure, the calves would still be succeptible to blackleg. In the case of HIV, I am told there are people that are resistant, mainly because some of their white blood cells (what HIV attacks) do not function in the way that most of humankind's WBCs do (what we'd consider normal), and HIV cannot enter. Were we to breed cattle that blackleg could not infect, we'd have to create something that wasn't "normal" and - offhand I don't know the route of infection - it may or may not be possible to create cattle that could not be infected by the blackleg bacteria. [/QUOTE]
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Black leg....a doozer of a question
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