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Its done after the animal is killed. The same thing that helps keep hooves tough is separated and used in making glue. You could use just the trimmings from a farrier, but it would take so long to get enough it wouldn't be worthwhile in the end. While there are still slaughter houses there are always enough hooves for any byproduct be it glue or dog chews.
Most horses are slaughtered as soon as possible. However because not everyone who brings their horse to auction intends them to go to slaughter knowing a wormer is not safe to consume could be helpful.
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