# Kai Ken (甲斐犬) Nihon Ken — Kai Ken. Breed health: 1,752 dogs, 325 founders, gene diversity 98.84%. See all Kai Ken: https://nihonken.org/pedigree/browse?breed=kai&format=md ## Overview A free population-genetics overview across the 1,752 Kai Ken in the database — gene diversity, inbreeding over time, and the ancestors shaping the lines. Every figure is a floor on incomplete pedigrees: true values may be higher. ## Genetic diversity - **Dogs:** 1,752 - **Founders:** 325 - **Gene diversity:** 98.84% - **Mean kinship:** 1.16% · sampled estimate - **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. ## Inbreeding over time Mean cached COI per birth-year cohort (952 dogs with a computed COI). Population means, not individual COIs. 1933 — 6.25% (1 dogs) 1948 — 0.00% (1 dogs) 1956 — 1.56% (1 dogs) 1961 — 8.18% (1 dogs) 1963 — 8.20% (1 dogs) 1964 — 20.63% (1 dogs) 1965 — 20.31% (1 dogs) 1966 — 30.00% (2 dogs) 1967 — 16.73% (7 dogs) 1968 — 28.22% (1 dogs) 1969 — 11.20% (7 dogs) 1970 — 3.06% (4 dogs) 1971 — 1.09% (2 dogs) 1972 — 27.96% (1 dogs) 1973 — 14.55% (2 dogs) 1986 — 1.22% (1 dogs) 1989 — 14.99% (1 dogs) 1991 — 0.00% (3 dogs) 1993 — 0.00% (6 dogs) 1994 — 0.00% (4 dogs) 1995 — 8.78% (5 dogs) 1996 — 0.00% (2 dogs) 1997 — 6.33% (3 dogs) 1998 — 13.59% (3 dogs) 1999 — 10.47% (3 dogs) 2000 — 0.00% (4 dogs) 2001 — 4.22% (5 dogs) 2002 — 0.00% (1 dogs) 2003 — 10.56% (8 dogs) 2004 — 9.95% (8 dogs) 2005 — 0.00% (3 dogs) 2006 — 2.47% (9 dogs) 2007 — 9.66% (22 dogs) 2008 — 10.06% (21 dogs) 2009 — 7.74% (17 dogs) 2010 — 5.60% (28 dogs) 2011 — 9.63% (51 dogs) 2012 — 1.56% (52 dogs) 2013 — 2.38% (39 dogs) 2014 — 3.28% (44 dogs) 2015 — 3.83% (48 dogs) 2016 — 3.84% (47 dogs) 2017 — 5.06% (34 dogs) 2018 — 3.66% (74 dogs) 2019 — 2.43% (46 dogs) 2020 — 2.70% (73 dogs) 2021 — 4.09% (32 dogs) 2022 — 3.49% (41 dogs) 2023 — 3.41% (48 dogs) 2024 — 2.91% (25 dogs) 2025 — 3.85% (24 dogs) ## Top ancestors - **#1:** [Kai Kokushin go Jōnan Kensha · centrality 0.0005514670160713638](https://nihonken.org/pedigree/dogs/57f254ec-082f-43b1-9bfb-b212a7b13e2f) - **#2:** [Aya no Takahime go Funato Kamiyama-sō · centrality 0.0004999114449899394](https://nihonken.org/pedigree/dogs/0f2b9dc4-c306-4193-aafc-494cfb5dda69) - **#3:** [Haruna No Eishin Go Gunma Kawashima Sou · centrality 0.0004491506467710488](https://nihonken.org/pedigree/dogs/cac8288c-8835-486f-97e2-2ea23c74bccc) - **#4:** [Wakahonjin go Fujimine · centrality 0.0004338654609777581](https://nihonken.org/pedigree/dogs/0de0b306-50a4-4ba6-ba70-010b7de9dede) - **#5:** [Tenrou No Wakajishi Go Tenrou Kensha · centrality 0.0004071850520831855](https://nihonken.org/pedigree/dogs/014ee711-2fdc-44ec-951e-4897031f75a3) - **#6:** [Rikirō go Takahata Kensha · centrality 0.0004058476411828582](https://nihonken.org/pedigree/dogs/16787fce-0994-4086-b00f-6a784049715c) - **#7:** [Tone no Isshin go Sai no Kuni Inoue-sō · centrality 0.0003960315455850744](https://nihonken.org/pedigree/dogs/91d0323e-bd1b-4255-bd31-f81a84e47d84) - **#8:** [Walnut Valley's Mavis O'MM · centrality 0.00037432350398879924](https://nihonken.org/pedigree/dogs/d55cc1e0-0898-4323-ad84-1634abf61d3b) - **#9:** [Sai No Makohime Go Sai no Kuni Inoue Sou · centrality 0.0003425878587786023](https://nihonken.org/pedigree/dogs/3514aa1f-ff75-42cc-9637-9de060264113) - **#10:** [Haruna no Ranhime go Sai no Kuni Inoue-sō · centrality 0.00031201135541386496](https://nihonken.org/pedigree/dogs/a964d63b-ddf8-46ce-9639-ebc9974d18f8) ## Dogs - **Chitan go Miyamoto-sō Adachi-shi チタン号 宮本荘 足立氏:** [](https://nihonken.org/pedigree/dogs/c5831fdb-59b1-4a46-8329-bbc910719d0e) - **Kai go Kobayashi-shi ⼩ 甲斐号 林氏:** [](https://nihonken.org/pedigree/dogs/2921f48f-86f9-4241-8a62-3d75890d754b) - **Ken go (Ken go ) Nishiyama-sō Kobayashi-shi ⼩ 剣号 ケン号 西山荘 林氏:** [](https://nihonken.org/pedigree/dogs/6f87f00d-247b-4364-b840-59d9c35aa3c5) - **Kikumi Go Fuurinkazan:** [](https://nihonken.org/pedigree/dogs/292ebbe7-ac76-415a-86f1-86e850db198a) - **Tatsu go 竜号:** [](https://nihonken.org/pedigree/dogs/e2e9ea23-e3b6-4688-9749-9c91c07c9b28) - **A'Karube Go des Fidèles Akita Ken:** [LOF 79](https://nihonken.org/pedigree/dogs/68d71a93-3492-4c55-ad04-4a0114926dad) - **A'Kohime Go des Fideles Akita Ken:** [LOF 83](https://nihonken.org/pedigree/dogs/e3c9ca9c-aefd-47a3-a045-9efab094a195) - **A'Kurai Go des Fidèles Akita Ken:** [LOF 84](https://nihonken.org/pedigree/dogs/44c91333-fe46-4c8c-bcc2-f5c1c5083d38) - **Akahana Go Ounoki Kensha 赤花号 王の木犬舎:** [](https://nihonken.org/pedigree/dogs/47b7b03c-8503-449e-90c7-dd8beb90bd1e) - **Akaryuu Go Ounoki Kensha 赤竜号 王の木犬舎:** [](https://nihonken.org/pedigree/dogs/c5efdf28-07cd-4109-9a5b-f965f4fca8d7) - **Akira Kenmaru go GO Proud FCI 明拳丸号 誇り号:** [](https://nihonken.org/pedigree/dogs/adcf2baf-d40e-492d-a352-9b98cc695634) - **Aoarashi no Roushin go Yuugiri Sou 青嵐乃狼神号 夕霧荘:** [KKA 47664](https://nihonken.org/pedigree/dogs/7bd4fba9-855a-4f59-863e-3441a21c9a20) - **Besmira's Princess Aurora Borealis:** [](https://nihonken.org/pedigree/dogs/9498d292-104e-4625-a341-92d6792f4109) - **Besmiras Kai Jr. Like His Father:** [](https://nihonken.org/pedigree/dogs/b5d2f337-dbb8-4883-8dc7-faf2b4b75bac) - **Bi No Jouou Go Ihoku Hakurensou 伊北白蓮荘:** [](https://nihonken.org/pedigree/dogs/b8c1c958-184c-4337-af11-ef8b088b94f6) - **Classy's Arctic Moonlight:** [](https://nihonken.org/pedigree/dogs/a26cac33-51d0-44a4-8fd6-9343e2f047dd) - **Classy's Hello Kitty Go Lightly:** [AKC WS48576501](https://nihonken.org/pedigree/dogs/304b9411-518b-462d-af20-5482040de531) - **Dairō go Saga Shio Kensha (Hayashi Tokiharu-shi ) 大狼号 嵯峨塩犬舎 林時春氏:** [KKA 4298](https://nihonken.org/pedigree/dogs/d68aa305-9aca-4fc7-97ed-7ddea65300e5) - **En go Morisawa-shi エン号 森沢氏:** [KKA 43](https://nihonken.org/pedigree/dogs/da64abd9-0d51-48ca-9894-9f0f12d6679d) - **Fujihime go Chitoseya-sō 富士姫号 千歳屋荘:** [KKA 2160](https://nihonken.org/pedigree/dogs/cb41f764-b014-4172-b0ba-f3b402108736) - **Gekkoo No Amaya:** [](https://nihonken.org/pedigree/dogs/a81c9e6e-60c0-4350-a4db-814441e5b54e) - **Gekkoo No Daranibo:** [](https://nihonken.org/pedigree/dogs/c67818fc-7c02-4068-b92a-501fe3e74f12) - **Gekkoo No Etsuko:** [](https://nihonken.org/pedigree/dogs/00fa8fea-3bc4-411f-b75a-65eb61a13b12) - **Gekkoo No Saanan Salaisuus:** [](https://nihonken.org/pedigree/dogs/ab967812-6ac0-4e8d-ac50-49a864c28815) --- **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_