Temptations or Fortiflora probiotic powder. Kitties go wild for it. And some cats don't care for catnip, or it makes them kind of nutty.UPDATE:
On Saturday morning I bought some sliced mortadella and along with the bottle of spray catnip off I went to my trapping adventure.
On my arrival on the spot I saw one of the cats that I would like to catch. I set up the trap with the mortadella after having sprayed the catnip on the cage.
Unfortunately the cat I saw on my arrival had disappeared by the time I was ready... I waited an hour, but I didn't see her again.
So I moved and saw another of the cats I have in my trap list. I spread some tiny pieces of mortadella around the cage so to entice her. After 30 minutes she came closer, ate all the pieces around and walked away. The trap and the bait, though, attracted several other cats that I don't need to trap because they were fixed already.
Three hours later I thought I was tired enough and decided to pack it up and go back home.