My porkers go off at around 60kgs deadweight; a good commercial lamb is 20kgs deadweight.
However, I think the proportion of butchered meat is probably higher with the porker, so perhaps work on 3.5 lambs to 1 porker?
If you're comparing to primitive lambs, though, the lambs would be smaller. I got 55kgs butchered meat off 4 Castlemilk Moorit hoggets.
And some porkers will be larger...
Hope that was some sort of help, anyway!
Topic: How big is a whole pig freezer pack, compared to a whole lamb? (Read 2450 times)