# Kai Ken breed report 2026 Population-genetics report for Kai Ken, 2026: 1,752 dogs on file, 380 born in the last 8 years. ## Summary - **Dogs on file:** 1,752 - **Born in the last 8 years:** 380 - **Reference sample:** 380 dogs (seed 2026, 10 generations) - **Computed:** 2026-09-04 ## Inbreeding over time Mean cached COI per birth-year cohort — population means, not individual COIs. Every figure is a floor: COI is capped at a fixed generation depth, so the true mean may be higher. 1933 — ≥ 6.25% (Moderate) · 2.3% complete · 1 dogs 1948 — ≥ 0% (Indicative) · 0.7% complete · 1 dogs 1956 — ≥ 1.56% (Indicative) · 2.8% complete · 1 dogs 1961 — ≥ 8.18% (Moderate) · 11.3% complete · 1 dogs 1963 — ≥ 8.2% (Moderate) · 4.6% complete · 1 dogs 1964 — ≥ 20.63% (Elevated) · 3.7% complete · 1 dogs 1965 — ≥ 20.31% (Elevated) · 1.5% complete · 1 dogs 1966 — ≥ 30% (Elevated) · 10% complete · 2 dogs 1967 — ≥ 16.73% (Elevated) · 10.2% complete · 7 dogs 1968 — ≥ 28.22% (Elevated) · 6.3% complete · 1 dogs 1969 — ≥ 11.2% (Moderate) · 11.5% complete · 7 dogs 1970 — ≥ 3.06% (Indicative) · 9.1% complete · 4 dogs 1971 — ≥ 1.09% (Indicative) · 4.8% complete · 2 dogs 1972 — ≥ 27.96% (Elevated) · 20% complete · 1 dogs 1973 — ≥ 14.55% (Elevated) · 12.3% complete · 2 dogs 1986 — ≥ 1.22% (Indicative) · 11.5% complete · 1 dogs 1989 — ≥ 14.99% (Elevated) · 39.4% complete · 1 dogs 1991 — ≥ 0% (Indicative) · 8.6% complete · 3 dogs 1993 — ≥ 0% (Indicative) · 8.6% complete · 6 dogs 1994 — ≥ 0% (Indicative) · 6.2% complete · 4 dogs 1995 — ≥ 8.78% (Moderate) · 7.1% complete · 5 dogs 1996 — ≥ 0% (Indicative) · 8.9% complete · 2 dogs 1997 — ≥ 6.33% (Moderate) · 10% complete · 3 dogs 1998 — ≥ 13.59% (Elevated) · 8.3% complete · 3 dogs 1999 — ≥ 10.47% (Moderate) · 7.3% complete · 3 dogs 2000 — ≥ 0% (Indicative) · 4.3% complete · 4 dogs 2001 — ≥ 4.22% (Indicative) · 9.7% complete · 5 dogs 2002 — ≥ 0% (Indicative) · 9.7% complete · 1 dogs 2003 — ≥ 10.56% (Moderate) · 9.1% complete · 8 dogs 2004 — ≥ 9.95% (Moderate) · 5.4% complete · 8 dogs 2005 — ≥ 0% (Indicative) · 6.8% complete · 3 dogs 2006 — ≥ 2.47% (Indicative) · 10.6% complete · 9 dogs 2007 — ≥ 9.66% (Moderate) · 12.1% complete · 22 dogs 2008 — ≥ 10.06% (Moderate) · 9.9% complete · 21 dogs 2009 — ≥ 7.74% (Moderate) · 12.1% complete · 17 dogs 2010 — ≥ 5.6% (Indicative) · 8.4% complete · 28 dogs 2011 — ≥ 9.63% (Moderate) · 10.9% complete · 51 dogs 2012 — ≥ 1.56% (Indicative) · 12.1% complete · 52 dogs 2013 — ≥ 2.38% (Indicative) · 11.1% complete · 39 dogs 2014 — ≥ 3.28% (Indicative) · 12.2% complete · 44 dogs 2015 — ≥ 3.83% (Indicative) · 14.7% complete · 48 dogs 2016 — ≥ 3.84% (Indicative) · 12.6% complete · 47 dogs 2017 — ≥ 5.06% (Indicative) · 15% complete · 34 dogs 2018 — ≥ 3.66% (Indicative) · 18% complete · 74 dogs 2019 — ≥ 2.43% (Indicative) · 19.3% complete · 46 dogs 2020 — ≥ 2.7% (Indicative) · 23.5% complete · 73 dogs 2021 — ≥ 4.09% (Indicative) · 25.4% complete · 32 dogs 2022 — ≥ 3.49% (Indicative) · 24.3% complete · 41 dogs 2023 — ≥ 3.41% (Indicative) · 26.5% complete · 48 dogs 2024 — ≥ 2.91% (Indicative) · 31.7% complete · 25 dogs 2025 — ≥ 3.85% (Indicative) · 33.2% complete · 24 dogs ## Founders 236 founders in the reference sample's known ancestry; the five most influential carry 18.06% of the known genome. Effective founders (fe): 69.11 — the number of equally contributing founders that would produce the same genetic diversity as the breed's 236 real, unevenly contributing founders. Founder genome equivalents (fg): 19 — a lower, more realistic figure that also accounts for genetic material lost to drift over generations; fg is normally lower than fe, never more than the number of founders whose lines still survive. - **Kai Mirai go:** [3.99% mean contribution](https://nihonken.org/pedigree/dogs/a6f2d47c-317e-469b-94f5-e0c0214ea83c) - **Kai Miyoshi go:** [3.99% mean contribution](https://nihonken.org/pedigree/dogs/bfbae371-33f2-4a9a-bfa6-06d1e7df1964) - **Fujihime go:** [3.54% mean contribution](https://nihonken.org/pedigree/dogs/a4006c2b-1f47-40e6-b077-3a661152dd5c) - **Fujisan go:** [3.33% mean contribution](https://nihonken.org/pedigree/dogs/f2c369f7-72b0-4432-8333-0f3f34c48008) - **Jōnan no Shō go:** [3.2% mean contribution](https://nihonken.org/pedigree/dogs/4057231f-9aee-422d-8118-da6a58cf9085) - **Fuji no Kanjuhime go:** [2.57% mean contribution](https://nihonken.org/pedigree/dogs/ee191d37-8cbe-4d63-a9b6-5f45597971bc) - **Jōshū no Hime go Kenshin-sō:** [2.22% mean contribution](https://nihonken.org/pedigree/dogs/07a12009-3258-4d65-bd8f-1189e8a3e5a5) - **Jōshū no Shō go Saitō Kensha:** [2.22% mean contribution](https://nihonken.org/pedigree/dogs/0c55b717-318c-431e-aa5a-5e8c782e1788) - **Kotetsu go:** [1.87% mean contribution](https://nihonken.org/pedigree/dogs/08985614-adb0-43ee-8a14-ee0796e8db74) - **Meru go:** [1.87% mean contribution](https://nihonken.org/pedigree/dogs/7ec5128a-3ff3-4f66-97cc-bb30d3404dc8) - **Kawasaki No Hime:** [1.74% mean contribution](https://nihonken.org/pedigree/dogs/e38f90b9-d891-4a6f-9501-7f53e59ed54b) - **Wakaba:** [1.59% mean contribution](https://nihonken.org/pedigree/dogs/ec132a3d-8830-4cd0-8ce3-ee03938b9883) - **Tamahime go:** [1.47% mean contribution](https://nihonken.org/pedigree/dogs/8d49b145-21a9-4a93-9eb0-d07400d3c0fe) - **Sankōrō go:** [1.47% mean contribution](https://nihonken.org/pedigree/dogs/dd8ddacb-a143-4eea-8f55-2f2afcbab877) - **Hanahime go Sanryū Kensha:** [1.34% mean contribution](https://nihonken.org/pedigree/dogs/7232c4ec-5937-465b-a23a-7c49a2f14cea) - **Showryu of Mushashino Sow:** [1.24% mean contribution](https://nihonken.org/pedigree/dogs/3d00655e-d752-4a17-9f19-4a4d3e11032e) - **Kikumi Go Fuurinkazan:** [1.18% mean contribution](https://nihonken.org/pedigree/dogs/292ebbe7-ac76-415a-86f1-86e850db198a) - **Kai Honjin go:** [1.17% mean contribution](https://nihonken.org/pedigree/dogs/69db0cd9-fbae-45e5-949d-b9b19f7e17b6) - **Jun go:** [1.17% mean contribution](https://nihonken.org/pedigree/dogs/f16320ec-4d6f-4600-b0ec-f78063863fb1) - **Kawasaki No Tetsu:** [1.11% mean contribution](https://nihonken.org/pedigree/dogs/10570c44-f029-48aa-b87c-7ae94d477868) ## Effective population - **Ne:** Not estimable — Mean inbreeding is not rising in the data (ΔF ≤ 0), so Ne is not estimable. Pedigree-based estimate from the rate of inbreeding, not a census Ne; a floor given incomplete pedigrees. ## How to cite Nihon Ken Pedigree Database (2026). Kai Ken breed report 2026. https://nihonken.org/pedigree/breeds/kai/report/2026. Accessed 2026-10-10. Licensed CC BY 4.0. ## Caveats Every COI figure is a floor: pedigrees are incomplete. 3% of the reference dogs' ancestry is unknown and 0.8% lies beyond 10 generations; fe and fg describe the known part. --- **Navigate:** [Home](https://nihonken.org/pedigree/?format=md) · [Search](https://nihonken.org/pedigree/browse?format=md) · [Litters](https://nihonken.org/pedigree/litters?format=md) · [Breeders](https://nihonken.org/pedigree/breeders?format=md) · [LLM guide](https://nihonken.org/pedigree/llms.txt) _Search by name: https://nihonken.org/pedigree/browse?q=NAME&format=md_