IMO . . . .My hatchery New Hampshires and Barred Rocks are laying very well (about 90% since they started laying around 5 to 5.5 months - they are 7.5 mo. now). I lost one NH pullet to unknown cause soon after she started laying, but otherwise they all seem hearty and healthy. What is it about heritage birds that makes them so much better. Everyone seems to agree on that, I just wonder. Is it production? Size? Health? Longevity? All of these things?
There is a chicken for every situation.
THe point of this thread is to support the birds that are generally regarded as dual purpose breeds developed long ago , and fell out of favor with the advent of the commercial strains. Many still breed these birds to the SOP and enjoy taking the birds to shows.
For me, I expect the birds to put meat and eggs on the table first.
I started with hatchery stock and still have some. My silver laced wyandottes are not as perfect in the feathering as those I have seen at shows. And the birds at the shows are usually meatier and larger than the hatchery stock based on comparing my hatchery birds to those at the shows. Certainly TheDragonLAdy's Buff ORpingtons dwarf my BO.
I also suspect that high productin is important to the sucess of hatcheries and as such egg production rates are kept up.
Longevitiy could be very different based on selection for this.
Just a few points to consider. Some talented breeders combine both show stock and hatchery stock as a starting point. Other people start with hatchery stock and work from there.
What I had noticed in my hatchery stock ( Meyers and Mcmurray) is that the body size is less than SOP but are good layers compared tot he breed specs. Because I wanted meat birds, I had to look hard to find a very well muscled bird.
Hope this helps; others will have different opinions and often better explanations.