Home Jidori and branded chicken Native breeds
Ukokkei
烏骨鶏Native breed No.5
Ukokkei is one of the 38 native breeds listed in Japan's JAS standard for jidori (No. 5 in Annex A).
- National natural monument
- Natural monument
Ukokkei（1942-07-21 designated）
Brands whose crosses include this breed
- Oita Kanmuri Jidori — The first Japanese jidori to use the Ukokkei (Silkie): a sire line carrying Ukokkei blood crossed with a dam line carrying Rhode Island Red and Kyushu Road; five breeds in all
These are the brands whose mating scheme, as given in that brand's source, names this breed. The share of its bloodline is not shown.
In numbers
All brands using Ukokkei are in Oita. One sets a minimum rearing period: 80 days (all chicken brands range from 75 to 150).
Counts cover only the brands in this guide.
Sources
Sources are in Japanese
- [J001] 地鶏肉の日本農林規格（平成11年農林水産省告示第844号、最終改正 令和7年9月2日） — Ministry of Agriculture, Forestry and Fisheries ・ Primary source ・ Accessed 2026-09-24
- [J002] 地鶏肉の日本農林規格 新旧対照表（令和7年9月2日、JAS 0844:2025 附属書A 在来種） — Ministry of Agriculture, Forestry and Fisheries ・ Primary source ・ Accessed 2026-09-28
- [M3125] 国指定文化財等データベース「烏骨鶏」 — Agency for Cultural Affairs (national cultural properties database) ・ Primary source ・ Accessed 2026-09-28