The 2017 drop Balmoral Sire Evaluation is interesting for all the wrong reasons.
An extreme weather event and a worm outbreak resulted in the death of 41% of the whole mob.
The losses of ANDERSON 120096 ‘s progeny at 12% were by far the lowest of all the studs, with the worst loss being 68%.
If applied to a mob of 1000 weaners, the difference in losses between the bloodlines with the worst and best survival rates would be 560 sheep.
As terrible as it is, it really puts a value on fat and worm resistance and their importance in lamb/weaner survival. There may also be an as-yet unknown factor that limited the losses of Anderson progeny- developed and refined by decades of breeding for robustness and resilience.