I've seen a recipe for horse hoof bait. All you do is take hoof trimmings and boil them awhile until they are soft, then put the mixture in a glass jar with a loose lid and place it in the sun for a few weeks, months, all summer etc... It is suppossed to be some of the LOUDEST smelling stuff you'll ever use and creates a strong digging response. Use it as a call lure, or in a dirt hole. Had some real good reports on it.
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Shoot straight, shoot often
Matt