Hello we are new to this and have a couple of questions. The first is how often should you clean a chicken coop? I went to a course and the fellow speaking said he cleans his only once a year. Is it a good idea to have a thick layer of the old stuff to keep the floor warmer in the winter? The second is about eggs. We have 52 brown Leghorns and we were getting between 48 to 56 eggs per day. We have have some cooler days (around -5c) with snow and for the last two days the chickens have laid no eggs, is this normal?