I have 14 pullets of varying breeds. RIR, LB, BA, SLW, Gold and Black Sexlinks. 3 days, 3 eggs. All the birds are the same age. It appears that the 3 eggs are from the same pullet. All 3 eggs are same size and color. Why aren't the others starting to lay?
Some lay early, some late. I have some chickens that laid a month or more after their sisters. Just depends on the bird. It'll happen.
