Blue, I'm not sure which "Feather Fixer" you are offering, but if its the common one, you want to recheck the label. Nutrena Feather Fixer is 3.5% calcium +/-, too high for roosters, cockerels, retired ladies and pullets before start of lay.
I'm hoping and suspecting you have another in mind...
I had to pick "other".
We don't have winter. Its more like late fall for a couple days, so it really would not have been fair of me to answer.
That said, I free range my flock and they get a significant portion of their feed from the pasture, reducing my feed costs somewhat. I expect, once...