The title of this thread is "beef cow efficiency". In my initial response I thought I defined the ratio I was talking about as the calf 205 day adj ww to cow weight at weaning.  I must have used that phrase a number of times and shortened it to WW ratio.  I am aware that the normal definition of calf ww ratio is the calf's rank within the peer group. That is not what we are discussing here.

Jim at Dawn