From what I remember of the Langshans I had(I can't for the life of me figure out the man's name I got them from), they grew rather fast. But took a long time to really fill out. They feathered painfully slow.Their body is also longer than it appears due to the stance of the bird. Fast growing and Langshans have an...interesting relationship. You tend to either get lines that sprout like weeds but take forever to put on meat, or you get lines that take forever to grow. Either way, they aren't a "fast" breed like the New Hampshire or the Delaware, but should be quicker to mature than their asiatic compatriots the Brahma and Cochin. I know rodriguezpoultry and I disagree on this aspect, but I know with my past with the breed you can get a good carcass at 6 months and pullets laying before they turn 7 months. So about on par with a Rock or Red, maybe a couple weeks behind. You start pushing them faster you lose size. You are very correct about the wide and deep body, which is one of the challenges of the breed, an inattentive breeder can often find them becoming either broad and deep but short legged, or narrow and shallow with too long of legs. As far as laying longevity, hopefully others can chime in as well, but I found about a 5% drop in production a year, so comparable to other breeds.
Once they did fill out though they were grossly overweight.
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