Usually my chickens are in the run all day and their water and feed is there. This past Monday it was getting cold out but they were still outside. They laid 1 egg out of 5 chickens. Tues/Wed/Thurs it was super cold (like -12F at 8 am) so I kept them cooped up with a heat lamp. It isn't a very big coop either so I was worried about them but they laid 5/5/4 eggs. They had never laid 5 two days in a row before and usually the day after they lay 5 I only get 1 or 2. Today I let them out although it was -2 this morning ,as I knew it would get into the 20's today. They laid 1 egg. Is it just timing or do they automatically retain their eggs when it's cold out?