I seem to remember that the commercial breed of NZ fed on the commercial diet was 3 pounds four ounces average at 8 to 9 weeks old & that short time slot was the critical time to make a profit or slip into loss either side of that time slot.
I can't recall the dress out weight ,for that was done at the processor's premises , He paid us live weight, but he'd always make sure he had his pound of flesh before parting with any dosh in our direction.