Raised in the valley between the Southern and Central Alps — a supreme Shinshu brand pork born of a devoted, carefully crafted feed.
In the Ina Valley of Iijima Town, Nagano Prefecture — nestled between the Southern and Central Alps — Hayashi Farm Co., Ltd. raises with devoted care two brand porks overflowing with individuality: ‘Genbuta’ (Phantom Pork) and ‘Shinshu Yukibuta’ (Shinshu Snow Pork). The feed uses an independently blended formulation of local buckwheat, rice koji, almonds, and others. Rutin derived from buckwheat has antioxidant action; the fermentation components of rice koji regulate the gut environment and support the pig’s health. Nuts including almonds add a premium flavor to the fat. This plant-based-centered feed design is the secret to drawing out the pig’s inherently fine-grained meat quality and sweetness. The breed incorporates the rare Medium Yorkshire — even within Japan — into the maternal lineage. The Medium Yorkshire has the characteristic of extremely fine muscle fibers that readily develop marbling. By crossing with Duroc — known for powerful umami — a pork of both delicacy and depth is born. ‘Genbuta’ was trademark-registered in 2003 and ‘Shinshu Yukibuta’ in 2004 respectively — both brands are raised over approximately 240 days — longer than standard pigs — growing slowly. By taking time, the umami of the meat is firmly concentrated, and the sweetness of the fat becomes richer. In shabu-shabu, a clear, transparent broth can be enjoyed — in tonkatsu, the result is crispy outside and juicy inside. Regardless of cut — loin, belly, and more — a pork in which the authentic deliciousness of the ingredient can be savored just as it is. Annual shipments approximately 2,000 head — rare. Please do savor this luxurious specialty nurtured by the Shinshu earth.
Basic Information
- Name
Hayashi Farm Ton – Genbuta / Shinshu Yukibuta - Production Area
Hayashi Farm Co., Ltd. (Iijima-cho, Komagun District, Nagano) — in the Ina Valley between the Southern and Central Alps - Management Body
N/A - Breed / Crossbreeding
Three-breed cross: Female (Middle Yorkshire x Large White) x Male Duroc - Meat Characteristics
Extremely fine-grained Middle Yorkshire muscle fibers with profound, complex umami from 240-day rearing; mellow nutty fat sweetness with a subtle almond-and-buckwheat character - Feed Characteristics
Self-blended plant-based formula: buckwheat (earthy aromatic richness), rice koji (natural sweetness and enzymatic activity), and almond (distinctive pleasant finish); antibiotic-free - Shipping Age
Approx. 240 days - Annual Production
Approx. 2,000 head annually. Primary slaughterhouse: Nagano Prefecture Meat Corporation (Matsumoto Branch). Primary wholesaler: Hayashi Farm Co., Ltd. - Signature Dish
N/A - Certifications
Trademark registration — Genbuta: July 4, 2003; Shinshu Yukibuta: July 12, 2004
Brand regulations: not established
Farm HACCP: not applicable
JGAP: not applicable - Related URLs
Hayashi Farm (Official Site)
Buta Trace – Hayashi Farm - Source
Branded Pork Guidebook 2026, p.121
Hayashi Farm (Official Site)
Buta Trace – Hayashi Farm
Last updated
6/21/2026