This is what i do..
I have leghorns (2) they are an older breed and not hatchery birds ..however I breed these birds and hatch out chicks..I raise them to sexual maturity, keep two pullets and butchery out the rest. I hatch early in the year so i have new birds to lay all winter long. New pullets lay the first full year with out moulting. If they stop laying the first year I butcher them in March or April .I do not want that in my flock. That work for early hatches only. late hatches might light molt and full moult in October/November so you end up with less eggs the first year from late hatches. So hatch early!!
Keeping a few leghorns every year will make sure you have eggs all winter. Hatching early will make sure you have winter eggs.
I hope this helps.
I would soup out all hens not producing by March. I would soup out all hens taking longer than two months to molt. You save the hen before health issues kills them and you get to use them for your family or feed them back into the flock if you are a vegan.
Sorry, this question was already asked, I just hadn't gotten that far yet. =o\
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