bfcc8476_y___The_Accidental_Smallholder__Term
[Definition] a measure of the number of lambs weaned in a flock compared to the number of ewes mated. This takes account of ewe and lamb mortality and should not be confused with the number of lambs born compared to the number of ewes giving birth. [Term] 
Lambing percentage
Sheep Terminology - The Accidental Smallholder
Term