I dug up an old chart I'd made on growth rate of a Silver Penciled Plymouth Rock. Just to provide real numbers for a heritage breed. Now if you know anything about the Silver variety of Rocks you'll know they are undersized and can't compare to the White Rocks. That said, Rocks grow frame first then flesh out. That's why New Hampshire are superior, better carcass at broiler age.
11 weeks of age- 4 lbs live weight----This is age they eat as much as adults.
14 weeks of age- 6.25 lbs live--------Nice weight for limit age of broiler.
19 weeks of age- 7.5 lbs live---------9lbs feed for 1 pound meatier roaster
You wont get weights at these ages from hatchery stock. They simply are not bred to be dual purpose. Standard bred birds that were traditionally dual purpose still are. By that I mean breeder stock.
11 weeks of age- 4 lbs live weight----This is age they eat as much as adults.
14 weeks of age- 6.25 lbs live--------Nice weight for limit age of broiler.
19 weeks of age- 7.5 lbs live---------9lbs feed for 1 pound meatier roaster
You wont get weights at these ages from hatchery stock. They simply are not bred to be dual purpose. Standard bred birds that were traditionally dual purpose still are. By that I mean breeder stock.
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