Home Jidori and branded chicken Kochi
Tosa Jiro
土佐ジロー Kochi
English name: Tosa Jiro — no official English name found, so romanised by this site.
Requirements for Tosa Jiro: breed — Tosa-jidori cross (F1); where raised — raised only within Kochi Prefecture; chicks are collected from the rearing station in Tosa Town or Shimanto City; rearing period — males for meat are reared for roughly 120 to 150 days from hatching; housing — floor housing from 28 days of age, with perches in the house; from 28 days of age, 4 birds per m² or fewer. Also: grain feed must be IP-handled and post-harvest-pesticide-free; at least 30 g of green feed a day, as a rule every day; Males and females are kept together, one male for every twenty females; Only second-division members registered with the association may sell the meat, using the association’s own label with the producer’s details; The association states that the brand meets the JAS criteria for jidori.
Definition — what qualifies
| Breed | Tosa-jidori cross (F1) A first-generation cross of the Tosa-jidori — a designated natural monument — with Rhode Island Red females; only hatching eggs produced at the Kochi Livestock Experiment Station may be used Native-breed blood percentage: 100% Sources: [D004] |
|---|---|
| Where it must be raised | Raised only within Kochi Prefecture; chicks are collected from the rearing station in Tosa Town or Shimanto City Sources: [D004] |
| Rearing period / age at shipment | Males for meat are reared for roughly 120 to 150 days from hatching Sources: [D004] |
| How it is housed | Floor housing from 28 days of age, with perches in the house from 28 days of age, 4 birds per m² or fewer Sources: [D004] |
| Other conditions |
Grain feed must be IP-handled and post-harvest-pesticide-free; at least 30 g of green feed a day, as a rule every day [D004] Males and females are kept together, one male for every twenty females [D004] Only second-division members registered with the association may sell the meat, using the association’s own label with the producer’s details [D004] The association states that the brand meets the JAS criteria for jidori [D004] |
Japan's JAS standard for jidori sets four conditions: the chicks, the rearing period, the housing and the stocking density. A brand's own conditions can be stricter, or set differently. The JAS standard for jidori →
Native breeds named in this brand's cross: Tosa Jidori ・ Rhode Island Red （All 38 native breeds）
Four birds per m² is the second-strictest stocking density on this site, after Miyazaki Jitokko’s two (the JAS standard for jidori allows ten from 28 days of age). Note that the prefecture’s public pages describe free-range as a required condition, while the rearing manual — the source of the conditions — says floor housing from 28 days of age and treats an outdoor run as optional. The trademark is held by Kochi Prefecture, not by the association.
Compared with other brands
21 chicken brands set a minimum rearing period, from 75 to 150 days. 120 days ranks 3rd from the longest (5 others also use 120). 17 brands cap the number of birds per square metre, from 2 to 10. 4 birds ranks 2nd from the most spacious.
This guide lists 4 brands from Kochi (also Tosa Akaushi, Tosa Rouge Beef and Tosa Wagyu). By prefecture →
Compare this brand side by side with others → ・ Find brands by their rules →
Counts cover only the brands in this guide.
Guides
Managed by
- Managed by
- Kochi Tosa Jiro Association
- Official site
- https://tosajiro-kyoukai.jp/
Other brands from Kochi
- Tosa AkaushiBeef brands
- Tosa Rouge BeefBeef brands
- Tosa WagyuBeef brands
About the names
Brand names are proper nouns. English names follow the brand association's official English page first, then the English name in the GI register, and otherwise romanised Japanese plus "Beef", "Wagyu" or "Pork". We never call a non-Wagyu brand Wagyu.
Sources
Sources are in Japanese
- [D004] 土佐ジロー飼養マニュアル（2025年12月版） — Kochi Tosa Jiro Association ・ Primary source ・ Accessed 2026-09-28
- [D005] 土佐ジローはいかが？ — Kochi Prefecture ・ Primary source ・ Accessed 2026-09-28