I and most of the other farmers around here aim for zero mismothering which seems to happen when the first lambing is when they're fully grown and mature. One year my neighbour's Badger Face tup got in with his ewe lambs. When we compared notes we found those ewe lambs (on almost identical ground and management) were 10% smaller at maturity and produced two to three crops less lambs than ours.
That is very interesting, what breeds where the ewe lambs?
did the notes record from when both sets of ewe lambs turned one year old (at lambing or not in the case of the dry ones) up until they left the flock as culls/or died?
I would not want to run in lamb hoggs on identical management to dry hoggs as effectively they are in lamb ewes and should be treated as such, I would never expect in lamb ewe lambs to do better or as good as dry ones if they were treated exactly the same
So if your comparison was run on the fact the two groups were run identically, then I am not surprised the ones which lambed were 10% smaller
My dry hoggs get poorer grazing throughout the winter, with only a small bit of dry hay if it snows
My in lamb ones get the slightly better grazing alongside the in lamb ewes, also they will get haylage a week or so pre lambing with the in lamb ewes, so as they are in lamb they need to be treated the same as lambing down ewes, and not the same as the empty dry hoggs would be treated
I and others in my area also aim for zero mis mothering, if any ewe mis-mothered whether she be a ewe lamb or not she is culled out of the flock, so I wonder if by doing this, we have produced a ewe lamb that is a better mother hence why we find our ewe lambs lambed down as ewe lambs make better mothers as shearlings, perhaps it is due to the selection when lambing as a ewe lamb