In Shel's story in 400 Days Roman asks Shel to help him feed to watchdogs. Their "food" turns out to be a bucket of bloody parts.
Was Roman's group killing intruders at the pit stop and feeding them to walkers? This would be very akin to the Governor and would make me even more disgusted with the cancer survivors. PS I dont think they were animal parts as who would waste food trying to feed walkers?