I have only had the goats/sheep (2 goats, 2 sheep, 3 wethers, and one ewe) for about 6 months and they have been living off the 2+ with about a pound of gain per day. My question is are they not getting enough food? Or is this what goats do? They are eating the bark off some 40 year old Fir trees and I'm concerned. Will they Kill the 3 trees?