Ancestor loss (AVK) is a measurement of how many individuals there are in a dog’s pedigree. This number gives an indication on the genetic diversity in the genes of the animal. In iwdb.org, we have two numbers, ancestor loss, which is the number and percentage of “lost” individuals due to inbreeding and Ancestor Loss Coefficient, which states percentage of unique individuals in a dog’s pedigree.
Generally, it’s desirable to have as many unique individuals in the pedigree as possible, giving a high ancestor loss coefficient. The number will decrease when the number of generations increases.
Ancestor Loss is available in the Ancestors pane of iwdb.org