Subdivision is one of the factors leading to increase in inbreeding higher than those expected
regarding population size. Measuring population subdivision is not straightforward given that it is
established rather diffuse. A measure of population subdivision from pedigrees is presented. It is
based on the direct comparison of the increases in coancestry and the increases in inbreeding
computed over equivalent discrete generation. Coancestry and inbreeding rates were established
from the average of individual values of those parameters. The usefulness of the new parameter
from a descriptive point of view is illustrated using a simulated population and two real populations
with an opposed scenario regarding subdivision.
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