How did you figure out how much commercial feed they eat vs. how much they eat free ranging? 40% in the winter is amazing. Do you know what it is in the summer, too?
No, don't mind at all. Though, it's a bit difficult to find a quick answer.
And after having written a bunch of blather, I guess the hard truth is: I feel bad and I want to feel better. I needed something to focus on and then I got that pretty blue egg and wah-lah! Ordered an incubator. I'm not one to do things on a whim and I never intended to incubate chicks before a few weeks ago, but...anyway. Not to be all sad-sacky on you, just struggling and trying to work through it in my own way 'cuz that's the only way I know how.
Of course, we know these types of quick fixes are fleeting. Worth a shot.
I have much the same experience as you do: the chicks that hatch and live to adulthood haven't ever substantially increased numbers. The only thing that I have to deal with now (that I never thought I'd be able to) is dispatching excess cockerels. It's not any fun, but it's fulfilling in a way. I don't
need to purchase any meat that we didn't raise.
Now if I could only figure out how to rid my garden of weeds...I could really be self-sufficient foodwise!
Maybe I need to find edible weeds...