I don't believe that all heritage lines, of a given breed, are identical. If the birds, say Rocks or Reds or what have you, have been bred well, very well, very close to the standard, but with an emphasis by a certain keeper/breeder of that line with an eye to this or that, then after 10 or 20 years? That's what those birds become. If they were bred for frame and meat? The keeper of that line should be able to demonstrate good quality in that emphasis. If they were selected for quick feathering, a usual sign of good laying, and laying records kept carefully? A given line can easily lay 20-30 eggs more than another line where such was not the emphasis. Would this difference push someone toward the "Smith" line as opposed to the "Jones" line?
Dunno. Quite possibly. Different strokes for different folks. I don't believe it wrong for a prospective buyer to ask these questions of a breeder.
Dunno. Quite possibly. Different strokes for different folks. I don't believe it wrong for a prospective buyer to ask these questions of a breeder.