We don't specifically wean our lambs. We do take the males out at 16 weeks for safety, but we leave the ewe lambs in with their dams. The ewes wean them themselves and just about all are fully dry by 20-22 weeks, plenty of time to get back into condition before tupping time, when we separate the ewe lambs so they are in with any non-breeding ewes while the tups are in with the breeding ewes. This way is pretty calm and laid back and we have never had a problem with it. We do frequent visual udder checks to monitor progress.