I have 4 RIR hens that are about 8-9 months old now. This december, they laid their first eggs, and strangely enough, laid about 4 eggs a day until about a month ago. Then it was about 3 or 4, then 3, now sometimes I'm only getting 2. Can someone explain what might be going on? Winter is over, spring is almost here, more daylight, and now they are slowing production?