Ethical Chickens are Flax-Free
Flax seeds are best used for the production of commercial oil, known as linseed oil and for making flax seed gel.
Flax seeds contain cyanide, high levels of phyto-estrogen which can mimic the bodies hormone production. Artificial hormones are linked to many strains of cancer, tumors and early childhood development.
It is not safe to feed livestock hormones for the very same reasons. According to  Kelly Hogan, a clinical nutrition and wellness manager at Mount Sinai’s Dubin Breast Cancer Center “Whole flax seeds can typically pass through the intestines undigested because they cannot naturally break them down,” she said. “If you eat flax seeds whole, you will likely pass them whole in your stool.” Kelly Hogan also stated "“They can start to go rancid fairly quickly – as soon as a few weeks after they are ground,” she said. “This is when the fats start to oxidize, and here is when you can also lose the nutritional benefits of those fats. The taste is also off.”
 U.S. Food and Drug Administration. Archived from the original on 17 June 2015. Retrieved 1 June 2015. "Like many common foods, flax contains small amounts of cyanogenic glycoside, which is nontoxic when consumed in typical amounts, but may be toxic when consumed in large quantities." 
Ethical Chickens do not eat flax seeds. Ethical Chickens do not need indigestible seeds extra estrogen or, cyanogenic glycoside in their diets.