Not to knock either of you, but how is this humane to the animal you release back into the wild? It's still susceptible to disease, it's still eating from dumpsters (lord knows how many get stuck n the dumpsters and hauled off to the dump), it's still freezing during the winter, and it still has to fight off larger animals, not to mention the damage it causes to indigenous bird population. I also wonder who's going to catch the cat next year to give it a rabies booster.
I'm all for catching and finding homes for any offspring that can be domesticated, but to put these animals back into the wild just sounds more like torture to me.