I have an adult Anatolian shepherd. She has full run of 11 fenced acres and keeps the coyotes and mountain lions from jumping our fence. She works A LOT!
In the summer, she is offered 4 cups of food a day. Sometimes she eats all 4 cups, sometimes just a cup or two.
Now that winter is here, our temps dip down to single digits and even into negative ones. (Since I have been here, the worst I have seen is -17 but records are to -30s) She is offered 6 cups of food daily. There are times she cleans the bowl and times she leaves half.
When available I do feed extra cockerels to her. She get a de-headed and plucked bird (plucked because it has weirded me out to see the dogs eating a feathered bird) that generally weighs about 1.5 pounds. These are her favorite - she gets so, so, so excited when she sees the chicken bucket being brought out for her. She prefers her eating chickens to have "aged" for atleast 24 hours after being processed.
She is loose with the chickens, ducks and geese and would not think to harm the live ones.
We have 3 dogs - a border collie (2 cups per day), cane corso (4 cups per day) and the anatolian. We go thru a 50# of Diamond dog food a month. Our anatolian is fine with our inside dogs (bc and corso) and intensely dislikes any other dog, even our neighbors' dogs.
I also do not think that an english collie would do much to deter coyotes. Before the anatolian, the coyotes would jump the fence and then leave when the other two dogs rushed it. Now the coyotes don't even walk next to our fence.