My  

 is fresh beaver meat ! For several reasons
 #1- cats that are not starving want fresh meat where in the deep freeze they are hungrier and will eat anything 
 #2- fresh meat has eye appeal where rotten is dark 
 #3- using tainted meat attracts skunks,possums and critters I'm not targeting when I set cat traps that's what I want 
 All my cats have been caught on fresh bait  not saying you won't get any on tainted but I have better success with fresh