I definitely see this in our chicken future here. We don't manage to keep enough chickens around here for this yet, but we did back north. We used to run 2 batches of 50 meat and had about 65 layers at any given time.
All that fat just gone to waste :o( Boy, am I feeling pretty foolish. Ohh, the wasted years of ignorance.
We'd like to get more chickens here. We really need more chickens here. If we can somehow keep the predator population at bay for them to grow to usable age, I am definitely going to do some rendering 'round here!