I am a first timer and I have dual purpose birds such as RIR, Barred Rock and Buff Orphs, both hens and roosters, however, I would like to raise meat birds. People keep telling me that Cornish Cross cant even walk after 12 weeks because they are so fat. Are they impossible to hatch/breed? I would like to raise my own birds, free birds are better than hatchery birds... Ideas??? Maybe I should just hatch my dual purpose birds?