Ive been keeping track of how many eggs we get per day since we got the chickens. We have 5 hens of laying age and the norm was 3 to 4 eggs a day. Over the past week we have only gotten 1 to 2 per day with yesterday being the exception of getting 3. Do they slow down in the hot weather? Only other changes was to thier food last week but I have been mixing the two brands together. Any ideas?