as the others have stated you will have to back up the claim, and also when feeding them flax seed do it in moderation 10% of the feed.... feeding higher amounts will effect the egg flavor. It is also a great form of protein. I started feeding mine a mixture of diffy things after reading about it in the farmers almanac other feed you may consider adding to their diet is
dried sea kelp It is packed with natural macro-nutrients that supplement your bird's diet. Kelp supplies vitamins and minerals they just may not be getting. Kelp meal has been used extensively in the fancy for years. Many of our country's Top Breeders swear by it's effectiveness. It has shown to increase fertility, vitality, and vigor in many a breeder's flock. It helps keep your birds at their peak condition, giving them an edge against disease. Kelp should be added to your grain ration or commercial feed at the rate of 1 lb. to 33 lbs. of feed. You can add it directly to their feed, or top dress their feed by sprinkling kelp over it. which is good considering 4 1/2 lbs runs about 20$
I also feed mine dried fish meal soybean meal corn oats and a lil olive oil.
