We got a dozen each Buff Orpington & Plymouth White Rocks in late May 2010. They are approximately 9 months old. We got these two breeds as they were both large chickens. When do they reach full maturity? We have had to slaughter two of our chickens and they were quite small. I know they are slow maturing birds and we did not get them to be meat birds until they finished with their egg laying (2-3 years) but had a chronic egg eater who we butchered and a horribly mean rooster who maimed the hens. Would appreciate any insights and thoughts regarding this. Thank you.