When planning a litter, compare coefficient of inbreeding (COI) to published breed averages and watch for values that spike far above the median without a clear goal.
Watch for: repeating bottleneck ancestors on both sides in recent generations.
What rule of thumb do you use before approving a pairing?
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Accepted answer
We review 5-generation COI against breed club guidance and flag pairings that combine the same narrow sire line twice. If COI is high, we document a breeding objective and plan an outcross in the next generation.
I compare the pairing to the breed average from the registry tools we use. Anything two standard deviations above mean gets extra pedigree review before we commit.