I have a piece of hoof from my horse 3/4" thick. Is there a way to preseve this?

If it's just hoof material, there is no need to do anything but let it dry. You can buff the outer area to bring out some shine.

Thanks , This horse has his feet done every 5 wks. He grows a hoof like you would not believe
He has a bone spur on the side that grows longest , we have had him checked by New Holland they took care of Barborow