The pride of Hayashi Farm, Gunma — a brand pork born of rigorous hygiene management and a devoted commitment to proprietary feed.
Shiawase Pork (Happy Pork), produced by Hayashi Farm Co., Ltd., based in Maebashi City, Gunma Prefecture, is a brand pork that has steadily accumulated a sincere commitment to quality and the environment since its founding in 1953. Under the belief that pork quality is governed by the rearing environment, a three-site system separating the breeding, weaning, and fattening processes into dedicated farms, and an all-in, all-out method of replacing entire groups at once, are rigorously practiced — blocking the entry of pathogens from outside and realizing a hygienic, stable production environment. At the self-owned feed factory, the commitment to carefully formulating and producing only as much as needed for each day, and giving fresh dedicated feed to the pigs every day, has been consistently maintained for many years. Furthermore, stress on the pigs is suppressed to an absolute minimum through sensor-based automated temperature control and mechanization of feeding and excrement removal — creating an environment for healthy growth. The breed is a three-breed cross — Landrace × Large Yorkshire sows with Duroc male — achieving both outstanding meat productivity and rich meat quality. The pork shipped after a careful rearing period of 170 days is characterized by a soft, crispy texture and rich umami, with an exquisite balance between the sweetness of the fat and the depth of the lean. Annual shipments of approximately 300,000 head represent a top-class large-scale production system in Japan — yet Hayashi Farm’s sincere engagement with the quality of every individual animal stands out. This devoted production system is precisely why ‘Shiawase Pork’ can deliver authentic happiness and rich flavor to those who eat it.
Basic Information
- Name
Shiawase Pork - Production Area
Designated farms in Gunma Prefecture - Management Body
Hayashi Farm Co., Ltd. - Breed / Crossbreeding
Female (Landrace × Large White) × Male: Duroc - Meat Characteristics
Soft with a pleasantly crisp bite, rich umami, and a perfectly balanced interplay of sweet fat and savory lean meat. - Feed Characteristics
Custom specialty feed milled fresh daily at the on-site feed factory, formulated to each growth stage — never pre-made, always freshly prepared. - Shipping Age
170 days - Annual Production
Approx. 300,000 head per year (group total) - Signature Dish
N/A - Certifications
Trademark registered
Farm HACCP certified: July 3, 2019 - Related URLs
Hayashi Farm | Pig Farming in Gunma
Hayashi Farm Co., Ltd. (Former Site) - Source
Branded Pork Guidebook 2026, p.78
林牧場｜群馬の養豚－「品質」と「環境」にこだわった大規模で緻密な養豚業を－
株式会社林牧場（旧サイト）
Last updated
6/21/2026