I have 8 chickens total. One R.I. Red, three barred rocks, Three black sexlinks and one red sexlink. The R.I. red and one of the barred rocks are over a year old. The others are 6months old. We were getting 6 six eggs a day. In the last week we have only been getting 2 or three a day at most. I did give my flock a strawberry smoothie with oj and yogurt last week. Not very much. Could this be the reason the egg production has gone down? All are eating and drinking. Help.