I'm caring for a colony of feral cats in my neighbourhood and want to get the last two intact females spayed as soon as I can. They both had a litter of kittens in the middle of April, but I don't know where the kittens are. How soon can I get them spayed? They are both terrible mothers, they abandoned their last litters and the ones that I wasn't able to find all died. I don't want to do anything that will cause them to abandon their new litters or make their milk dry up, but obviously with feral cats the sooner I get them spayed the better. Any advice?