Richmond, Missouri is currently only receiving just over 10 1/2 hours of daylight this time of year. Chickens require 14 hours of light daily for optimal egg production. The 3+ hour deficit is likely the culprit and NOT your flock. Your area is scheduled to start receiving a full 14+ hours of natural daylight on May 4th, 2020. By this time, you will have noticed a significant increase in production the month prior. Link to source posted here so that you can bookmark it for future use, https://sunrise-sunset.org/us/richmond-mo/2020/5 (Switching months shown links are on both left and right side of webpage, about 2/3 of the way down the page.)