Feral cats earn their keep controlling rodents on agricultural land and stables. However, we do insist that the cats are fed the same quality and quantity of food as a pure pet.
Once these cats go to their new homes they will need to be confined to a holding pen containing beds, litter trays, food and water for 3 weeks.
This initial confinement is essential otherwise the cat would simply run away. It is the same principle as keeping a pet indoors when moving house. Once released, the cats will return for their daily feed.