Wikipedia ???? Please:
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May not mean the bird is a carrier...more likely it has a different strain of a disease/parasite/infection than their "new flock", which hasn't yet been exposed to and thus hasn't built a resistance to the specific strain and then start to become "sick" as a result.. The bird may not...
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No, you're missing an important point. When they get sick they're not allowed to "recover or die", they're culled. Even if they were to recover they'd still be genetically predisposed to the particular disease. Obviously other birds in the flock would also have been exposed to the...
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Well not exactly...You would never intentionally expose them to anything...You simply cull the weaker birds that seem to be more susceptable to say coccidiosis or high worm loads and use your healthier, seemingly more resistant birds, as your foundation for a breeding program...