One of our 4 isa browns layed their first egg today! Its about half the size of a largestore egg. My wife and i were very excited and surprised one of them was ready to lay. They recently started sing their egg laying song and two were squatting. Now my question is should i switch over to layer feed now? I only have a few lbs of flock raiser left so i have to buy more feed this week. I also opened up the nesting box for them today.