I recently received 6 month old hens from a woman and it's my first time keeping chickens. I hav 2 buff orpingtons 2 aurecanas (sp) a barred rock a Rhode island red. I just got them 2 days ago and the first afternoon found 2 Brown eggs....not sure who laid them. But none of the other's ate laying. Is this due to time of year, age?? Any idea who lays the Brown eggs. If the season is an issue is there anything other than heat lamps I can do to promote egg laying? Thanks!