My 21 hens are all exactly 23 weeks old....I have Buff O, Leghorns, Dom, Americanua's and RIR. All of my hens are now laying, except for the Amer. Have been since about 20 weeks. Are the Amer. slower to lay ? I keep looking for that green or blue egg and my patience is about exhausted !! I am getting about 6-8 eggs daily from these hen that are laying so I cant complain, I know.... But to see a blue or green egg will be the highlight of this entire venture, I think!! Thanks in advance for any input !!