# Shikoku Ken (四国犬) Nihon Ken — Shikoku Ken. Breed health: 4,169 dogs, 0 founders, gene diversity 94.40%. See all Shikoku Ken: https://nihonken.org/pedigree/browse?breed=shikoku&format=md ## Overview A free population-genetics overview across the 4,169 Shikoku 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:** 4,169 - **Founders:** 0 - **Gene diversity:** 94.40% - **Mean kinship:** 5.60% · 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 (3,123 dogs with a computed COI). Population means, not individual COIs. 1948 — 23.24% (2 dogs) 1949 — 2.34% (1 dogs) 1950 — 2.34% (1 dogs) 1951 — 30.27% (1 dogs) 1952 — 5.57% (2 dogs) 1953 — 16.01% (2 dogs) 1954 — 21.42% (4 dogs) 1955 — 11.67% (2 dogs) 1956 — 6.97% (3 dogs) 1957 — 18.63% (3 dogs) 1958 — 9.67% (10 dogs) 1959 — 13.44% (12 dogs) 1960 — 10.38% (6 dogs) 1961 — 16.83% (13 dogs) 1962 — 19.04% (6 dogs) 1963 — 19.94% (9 dogs) 1964 — 19.87% (6 dogs) 1965 — 14.27% (11 dogs) 1966 — 11.72% (4 dogs) 1967 — 16.37% (7 dogs) 1968 — 11.75% (11 dogs) 1969 — 13.96% (6 dogs) 1970 — 13.18% (3 dogs) 1971 — 24.85% (4 dogs) 1972 — 19.30% (5 dogs) 1973 — 17.39% (7 dogs) 1974 — 9.26% (2 dogs) 1975 — 7.94% (3 dogs) 1976 — 16.01% (6 dogs) 1977 — 9.37% (5 dogs) 1978 — 14.25% (9 dogs) 1979 — 16.70% (7 dogs) 1980 — 13.44% (10 dogs) 1981 — 16.34% (10 dogs) 1982 — 12.17% (14 dogs) 1983 — 14.11% (15 dogs) 1984 — 7.63% (5 dogs) 1985 — 10.84% (16 dogs) 1986 — 11.77% (10 dogs) 1987 — 9.60% (25 dogs) 1988 — 11.71% (14 dogs) 1989 — 9.14% (14 dogs) 1990 — 11.35% (16 dogs) 1991 — 14.83% (10 dogs) 1992 — 13.10% (10 dogs) 1993 — 9.61% (15 dogs) 1994 — 12.69% (9 dogs) 1995 — 13.92% (9 dogs) 1996 — 10.72% (12 dogs) 1997 — 8.10% (4 dogs) 1998 — 18.58% (6 dogs) 1999 — 12.30% (6 dogs) 2000 — 11.43% (8 dogs) 2001 — 12.88% (10 dogs) 2002 — 4.29% (1 dogs) 2003 — 17.11% (6 dogs) 2004 — 16.38% (3 dogs) 2005 — 11.53% (16 dogs) 2006 — 12.80% (23 dogs) 2007 — 12.87% (19 dogs) 2008 — 14.23% (17 dogs) 2009 — 12.93% (23 dogs) 2010 — 12.75% (43 dogs) 2011 — 14.50% (37 dogs) 2012 — 13.58% (50 dogs) 2013 — 13.52% (58 dogs) 2014 — 11.25% (86 dogs) 2015 — 12.35% (89 dogs) 2016 — 13.02% (138 dogs) 2017 — 12.47% (111 dogs) 2018 — 12.44% (148 dogs) 2019 — 11.65% (158 dogs) 2020 — 9.25% (169 dogs) 2021 — 11.03% (205 dogs) 2022 — 9.43% (119 dogs) 2023 — 11.21% (109 dogs) 2024 — 9.95% (124 dogs) 2025 — 9.65% (99 dogs) 2026 — 9.54% (7 dogs) ## Dogs - **Chidori go Hachidori Sou 蜂鳥荘:** [AKC HP73315601](https://nihonken.org/pedigree/dogs/4cda9748-2722-4d75-b83e-5bd508438a21) - **Choushun Go 長春号 高知古城:** [NIPPO 668](https://nihonken.org/pedigree/dogs/85acc022-f0c0-4164-acc8-53f88801fbf7) - **Kiyohime Go Ayumi Sou 清姫号 あゆみ荘:** [NIPPO H28-160](https://nihonken.org/pedigree/dogs/08ff670c-ce96-429f-bb3e-50b2dc6cb0a9) - **Kusunoki 楠号 岡山安原:** [NIPPO 483](https://nihonken.org/pedigree/dogs/da6e8764-6f30-4985-97db-f1a0863d1a2c) - **丹峰快雲号 丹波下鴨荘:** [NIPPO R4-277](https://nihonken.org/pedigree/dogs/e8cc6a3a-b4c8-4f19-88a7-43087326c52d) - **伊予の紅号 辻華荘:** [](https://nihonken.org/pedigree/dogs/24450fda-c1e3-4971-8fa5-74d57b305b5f) - **宝の帝号 備後吉原荘:** [](https://nihonken.org/pedigree/dogs/70f4745e-8413-4793-ba33-06af5df3d2a7) - **秋竜号 飛騨門前荘:** [NIPPO R5-508](https://nihonken.org/pedigree/dogs/43845bc6-9a67-4c3d-9102-0037e5b3e0c1) - **舞号 讃岐長門荘:** [NIPPO 9-2619](https://nihonken.org/pedigree/dogs/417142f2-71d9-4ffe-a3d7-12d810217838) - **Kikujiro 菊二郎号:** [NIPPO 6170](https://nihonken.org/pedigree/dogs/f430f53e-2600-4356-a2c8-f277611754d0) - **Kikuryoume Go 菊良女号:** [NIPPO 6173](https://nihonken.org/pedigree/dogs/5d793ad1-d8ac-4613-831a-f145fffd9221) - **Kikutaro Go 菊太郎号:** [NIPPO 6169](https://nihonken.org/pedigree/dogs/5110f7a2-dbc8-4147-b518-c0c84baea9b8) - **一岳号 愛媛金亀荘:** [](https://nihonken.org/pedigree/dogs/caabc495-a25d-44f2-af6f-0c5c0597db57) - **伊予の一郎号 菊間吉井荘:** [NIPPO H28-541](https://nihonken.org/pedigree/dogs/9e17d4a3-bac8-4900-931a-7db39672c421) - **劉太郎号 曽我部荘:** [](https://nihonken.org/pedigree/dogs/5803b207-6a2b-4cb6-b040-0a5fe1b22f28) - **城栄女号 長探舎:** [NIPPO 7-1909](https://nihonken.org/pedigree/dogs/223015fb-d67d-4057-ad3e-64ade2a2ead3) - **多摩乃豪源号 多摩吉秀荘:** [](https://nihonken.org/pedigree/dogs/94d5e819-949e-4ca3-88f9-80629c2f08c1) - **宝の大地号 安芸新月荘:** [](https://nihonken.org/pedigree/dogs/0505f325-0de4-4eab-9485-2e92bd512940) - **Iyo Tsukasa Sou 智乃舞号 伊予司荘:** [NIPPO R4-623](https://nihonken.org/pedigree/dogs/b37de2c4-f766-4903-8040-4c536d173c1e) - **東雲号 東橘:** [NIPPO R2-257](https://nihonken.org/pedigree/dogs/513f2dcc-8dfd-4fed-8b1c-1e10272155f1) - **桃華姫号 たまうら:** [](https://nihonken.org/pedigree/dogs/950629cc-d345-4cc5-8057-e2b93424d9ed) - **福山の秀錦号 福山一座:** [](https://nihonken.org/pedigree/dogs/8d3dfabe-1f6b-41ed-87dd-def3286b80c6) - **翔陽女号 日犬福山荘:** [NIPPO H25-713](https://nihonken.org/pedigree/dogs/c400deab-97e1-4654-beb1-fcca1b9d8a15) - **逢夢号 四国末廣庵:** [](https://nihonken.org/pedigree/dogs/05766bbf-00cf-4f9b-9447-c2bc07624c69) --- **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_