I want to have a flock of a dozen core birds and then allow them to hatch 20 or so in the spring. But I want to slaughter and store those extra birds in the fall. So while in the summer I'll have around 35, in the winter my flock will be back down to 12. Would a big coop that accommodates 35 birds be too large (and therefore cold) for 12 birds in the winter? Should I have a smaller coop for the winter. Can I get away with a small coop year round and then add some dog houses to the run each spring?