The truth is, no one can predict. Descriptions for breeds that describe them as "docile" or "somewhat aggressive" never apply to individuals, but to the breeds as a whole.
But the biggest issue is that unless you purchase birds from heritage breeders of purebred birds, lines kept for 50-100 years, you not getting a bird that may fit the breed in disposition anyhow.
Truebred breeds are far more likely to correctly reflect the breed's temperament, but hatchery stock isn't nearly as likely since the birds are not bred to the Standard and don't reflect the breed's Standard.
We have purebred, bred to the Standard, heritage Barred Rocks, and yes indeed. They are very docile and wonderful birds. We have had hatchery Barred Rocks that looked very little the breed and did not have the breed's true temperament either.
Hope that helps better understand the issues involved.
But the biggest issue is that unless you purchase birds from heritage breeders of purebred birds, lines kept for 50-100 years, you not getting a bird that may fit the breed in disposition anyhow.
Truebred breeds are far more likely to correctly reflect the breed's temperament, but hatchery stock isn't nearly as likely since the birds are not bred to the Standard and don't reflect the breed's Standard.
We have purebred, bred to the Standard, heritage Barred Rocks, and yes indeed. They are very docile and wonderful birds. We have had hatchery Barred Rocks that looked very little the breed and did not have the breed's true temperament either.
Hope that helps better understand the issues involved.