I have a brooder full of now 15 day old chicks, my layers and my meat birds for the year. With my meat birds this year, I decided to go with half of them the Jumbo Cornish Cross to butcher this spring, and the White rocks to do later on in the year. Saves on freezer storage! LOL Anyway, I decided to do a size/growth rate comparison just out of curiosity. So here are my results so far. I am going to try to update this twice a month, more if I have time.These birds are all on the same feed, in the same brooder, etc. I weighed them on a food scale, ironically enough, and the Cornish X weighs 10.6 ounces. The White Rock is 4.2 ounces, it is a cockerel BTW. The Cornish I don't know, I got those straight run. Pictures for visual comparison below, is this nuts or what?