I have five mature hens (2 Silkies, 1 Americauna, 1 Buff Orpington and 1 Leghorn) Only the Leghorn is laying eggs (one a day, faithfully). I cannot figure out why the others aren't laying! The Silkies were the last girls introduced back in October of 2016 and all of the hens are about 3 years...
I lost all but one of my hens to a raccoon attack. I reinforced their yard and added Nite Guard lights (so far so good). I purchased three new birds - two are 8 weeks old, one is 12 weeks. My coop is small - raised with a fenced in area on the bottom so the younger birds can come out and eat...