I have 24 chicks that I purchased from my local Feed Store. They get them from a hatchery out of Texas somewhere. I have 9 Rhode Islands, 9 Barred Rocks, and 6 Ameraucanas(Easter Eggers). I have noticed the lack of weights and statistics online so I figured I would share my results as they progress. My first weighing is today at 12 weeks of age, they were all purchased at the same time and kept together on the same feed, I let them out of the coop for most of the day starting at about 8 weeks of age. The feed is a Purina Mills Medicated Chick Starter feed. Percentages are based on the Highest weighing chicken being 100% and the percentage given being that of the average weight. Of the 24 chicks I believe I only have 1 cockerel, they were all sexed as pullets from the hatchery. At 12 weeks the results are as follows- RIR: Low weight-2 lbs, High weight- 2 lbs 12 oz, Average weight- 2 lbs 6.5 oz =89.5% BR: Low weight-1 lb 13.5 oz, High weight- 2lbs 6oz(Pullets) 2 lbs 6.5 oz(only suspected Cockerel in flock), Average weight-2 lbs 4.2 oz =84% Ameraucanas: Low weight- 2 lbs 2 oz, High weight- 2 lbs 11 oz, Average weight- 2 lbs 8.16 oz =93.5% I notice the following about the three breeds- RIR have a very uniform build to them(like a large egg shape) and are fairly mild mannered, BR have wider and shorter build with thicker legs and tend to be more human social, Ameraucanas have tall and slightly thin build overall and are incredibly flighty and stick to their own mostly.