I could understand how a bitter man raising poultry would give one stern warning to new neighbors with dogs.
How many of you haven't had your pets or investments torn to shreds by your neighbors dogs? if you would have warned the neighbors outright it probably never would have happened. But thats besides the point.
Any animal coming onto my property and eating my feed, is mine. The neighbor can gripe all he wants, but if he aint gonna take care of his birds, I will, and I'll also eat them and sell them however i see fit. Posession is 9/10s of the law, and by being on your property, they are in your posession.