The Isa Brown holds about 60% of The World Brown Egg Market. All other egg laying breeds are judged and compared to this breed. They offer you exceptional egg output resulting in low feed conversion. Bred for excellent egg size, the in-built adaptability allows you to produce a large and extra large egg size from 62 to 65 grams or so. Isa Browns have a current livability of 97.3% and hen housed average production to 76 weeks is 321 eggs. Average egg weight is 62.8 grams. Very dependable and consistent with their laying, this breed is also a very friendly and docile breed making them great for your flock!