Hi. I am new to chickens and have a mixed flock including black sex link, RIR, BR and SLW hens. All between 4-6 months old. They have had a DEFINITE increase in appetite in the last week, like eating 2-3 times as much. Is this a sign of imminent egg laying??? They are not free range birds, but have a very large run with access to grass and such. Thanks for the help.