We feed all natural feed: rabbits, prairie dogs, squirrels, beaver, bobcat, cattle, horse, some turkey, and any legal road kill. We gut all the carcasses, drain the blood, and flush out the cavity. We let the blood and water drain from the meat and grind freeze the meat in solid blocks. We have the multi-filter system in the catch trough to keep food particles and manure out of the urine. We sell all fresh and preserved urine. For those that as for it, we have set aside "AGED" urine. Daily tray cleaning is a must. I want the best possible urine I can collect and that's all I use and sell. Use the best and get the best results.