Yes. A hen can only lay one color of egg in her lifetime, determined by her genetics.
However - you will notices as her laying cycle continues, eggs may get progressively lighter, and then will return to darker and richer hue as the laying cycle starts anew. They will still be the same color, but a slightly different shade.
You may be confusing pure bred Ameraucanas for Easter Eggers or "Americanas". Ameraucanas have a breed standard and lay only blue eggs. Easter Eggers/Americanas are mutts, and can lay any color egg.
araucana
Yes some hens do lay green eggs.The araucana chicken lays green eggs.
The actual contents of the eggs are not green; the green eggs are produced by Araucana hens and Ameraucana hens. Unlike white and brown eggs, the green pigment (color) goes all the way through to the inside of the shell. With brown eggs, when you crack them open, the brown color is only on the outside of the shell. With Araucana eggs, when you crack them open, the green is on the inside of the shell also. You can view green and blue eggs on my bio page.
I raise true Araucana chickens and Araucana hens are usually a bit slow to start laying. On average in good conditions and with excellent lighting, the Araucana hens with lay their first eggs at around 5 to 6 months old. Americana chickens will often start to lay eggs much sooner at about 16 weeks of age.
Lavender Araucana chickens can be both cockerels and hens. Cockerels are male Lavender Araucanas, while hens are the females. Cock birds usually have larger combs, leg spurs, and brighter feather coloring compared to hens.
Absolutely not! Araucana and Ameraucana breeds lay colored egg in shades of green, blue, violet and rose.There are pictures of these eggs on my profile page because I raise Araucana chickens, I even have a few hens that lay "antique gold" eggs.
No. You cannot tell the color of eggs the chicken will lay by the color of their feathers. I have green egg laying chickens called Araucana's and they are not green chickens. Brown feathered hens lay both white and brown eggs as do white hens. Feather color is not an indicator of egg color, breed determines the color of the egg.
Feather coloring does not influence the color of the egg laid. The breed of the hen dictates what color her eggs will be.
Brown.
The feather color of a chicken does not affect the color of the eggs she lays. It is the breed of the hen that determines the egg color. A chicken that lays white eggs does not drop a brown egg every now and then either, a white egg layer will always lay white eggs. I have several white Araucana hens who lay Lavender colored eggs and a Black Cochin hen who lays light brown eggs (not black eggs)
Known as Easter Eggers, Americana and Araucana hens these breeds all lay colored eggs. Various shades of green, green /blue, lavender, rose are possible. The cross breeding of these breeds with other breeds can produce pastels such as Khaki and even gold toned egg shells.
Araucana hens are considered a moderately early maturing breed and will often produce their first egg at about 20 to 24 weeks of age. Purebred Araucana hens are rare so the pullets age at first production will vary depending on the gene mix. Eggs from a purebred Araucana will average 55 grams or small and they are not prolific layers.