If people remind me this coming July I'll get you weights of cockerels at 11, 12 and 13 weeks of age. No longer keep the Penciled Plymouth Rocks but the BLR Wyandotte seem to fill in fast enough. The contrast of breeder stock to hatchery stock should be eye opening to many here.
There is a more comprehensive and scientific agricultural study done decades ago. The results are very similar to the above study. It included Cornish Cross for comparison though the meat birds were butchered young and as with the above study the dual purpose birds were let to grow until 18...