Calculate Wright's inbreeding coefficient (F) from pedigree data to assess genetic diversity and breeding outcomes for dogs, sheep, and other animals.
Inbreeding Coefficient (F)
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Relationship Status
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Genetic Diversity Index
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Common Ancestors Found
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The inbreeding coefficient (F) measures the probability that two alleles at any locus are identical by descent. It ranges from 0% (no inbreeding) to 100% (maximum inbreeding). Higher coefficients indicate reduced genetic diversity and increased risk of genetic disorders.
Generally, coefficients below 6.25% are considered acceptable for most breeds. Coefficients of 12.5% or higher indicate close inbreeding and may increase health risks. Many breed organizations recommend keeping coefficients as low as possible while maintaining breed characteristics.
More generations provide more accurate results. A minimum of 3 generations is recommended, but 5-6 generations give better insight into genetic diversity. Deep pedigrees may reveal distant relationships not apparent in shorter pedigrees.
Common ancestors appear in both the sire's and dam's lineage, indicating some degree of relatedness between the parents. The more recent and frequent these common ancestors, the higher the inbreeding coefficient will be.
Yes, Wright's inbreeding coefficient formula applies to all sexually reproducing species. This calculator works for dogs, cats, horses, livestock, and any other animals with known pedigree data.
Unknown ancestors reduce calculation accuracy. Enter as much pedigree information as available - partial data still provides useful insights. Mark unknown individuals consistently (e.g., 'Unknown Male 1') rather than leaving fields blank.
Moderate inbreeding can help fix desirable traits but may also increase risk of genetic disorders and reduce vigor. Effects include potential fertility issues, immune system problems, and expression of recessive genetic diseases.