I have three Isa Brown hens that were hatched June 20 2008. On Janurary 1 2009 I started keeping records. This is though Jan 1 2010 928 eggs laid 77.33 doz .75 lbs of 17% laying mash per day = 273.75 lbs total for year 18.2 cents per lb= 64 cents per doz. Most eggs were jumbos The hens were housed in a unheated building . Given water twice a day if forzen. Always had 14 hours of light. They were hand fed the 3/4 lb of mash once a day.If they had been pastured less feed would have been used. You sure can raise your own egg much cheaper then store bought eggs. I wish I could get my feed price down. I beleive that the comercial farmer is paying about 13 cent per lb.