Mission to desex

I am raising money to help desex a large colony of cats, who have been breeding out of control for some time now. I have managed to get 22 of the cats refuge but many more still remain. They have a caretaker keeping them fed but he can't afford to do any more. With your help, the plan is to stop the breeding by desexing as many of the cats as possible. Doing so will buy more time for them to find homes without adding any more unwanted kittens into the colony. Thank you for your support