My 3 buff orpingtons are 22 weeks old -- healthy, funny, and happy, but no eggs yet. I'm beginning to think I may have no eggs until Spring, due to the dark, short days up here in the PNW. They sure look ready to lay -- nice red combs, doing the 'squat, making nests during the day...but no eggs. So, my question: I just ran out of chick feed and switched them to layer feed. I'd heard they were old enough for the switch. But, I'm doubting they'll be layers for a while. So, will they be okay with the new feed or do I need another bag of chick feed? Also, if they are out in a sand run each day, do I need to add grit? Oyster shell? I'm very new to this, so I appreciate your advice! Thanks.