have 3 hens that were laying a egg every couple days or so.. have not seen an egg for over a week. they all look healthy. not sure what is going on. the only thing i had done different was i let them out all day every day for a week. i could not find any eggs in the yard. so they didnt lay them somewhere else.. i have since put them back in the coop until the evening time. still no eggs yet.. any ideas?