SOP is 8.5 pounds for cocks. American bred Marans seem to be bigger than other origins. EE/Ameraucana/Araucana are much smaller birds and don't make much on a plate for the time it takes to raise them.Are Marans an extra large large fowl breed? Because my Marans rooster is 2 weeks younger then my Colombian rooster and they were raised together on the same feed and yet he is WAY bigger. And my Easter Egger roosters who are just a week younger then him are half his size.