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3420 Kashiwa Street, Torrance CA 90505

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About Super Prime Beef

Introduction of Super Prime Beef

Super Prime Beef was founded in 2012.

At the time of its establishment, it became successful in producing high quality Wagyu cattle; this was only possible by having a feeding program carried out by a Japanese Wagyu feeding specialist from Japan, by having this our brand meets and exceeds higher quality standers than the US standers.

Currently, we are feeding and raising our cattle at feedlots located in Oregon State and Washington State. We have two brands, which are "Kuroushi", and "Washugyu", we are currently shipping our beef product throughout the United States, and other countries overseas (such as Canada, Mexico, Japan, Taiwan, and Europe).

Brand (Kuroushi)

Kuroushi Tanaka Bokujou

What is Kuroushi?

Kuroushi is the American Wagyu beef, cattle crossbred between the Japanese Black Wagyu and the finest US prime Black Angus, raised in Oregon. We combine the best genetics from both countries, to produce the finest quality beef.

Two Most Important Factors

Superior Genetics

  • "Tajima" Black Wagyu + the finest Black Angus cattle (50/50) to F2 (75/25)
  • Superior genetics: Tajima semen from Japan, and Black Angus dam.

Feeding Program

  • Closely-held Japanese feeding technique.
  • All natural grains and grasses.
  • USDA Certified High Quality Beef (HQB) program provides high energy food rations.

Feeding Programs

  • All naturalfeed, same as in Japan.
  • USDA-certified Non Hormone Treatment Cattle (NHTC).
  • Raised in a completely stress-freeenvironment.
  • Experienced Japanese feeder cares for our cattle as carefully as in Japan.
    The Wagyu feeding specialist, manages and controls the whole feeding process.
    His long career in Japan, and knowhow, creates the best quality beef.
    He helps make taste of our Wagyu closest to that found in Japan.
  • The young cattle are fed dried rice strawto strengthen their stomachs. This aids in the better absorption of nutrients, which results in more marbleized beef.
  • Our cattle are raised to 27 to 30 months, significantly longer than US beef or domestic Kobe beef.
  • Since Kuroushi is more matured, it flavor is more distinctive (better marbleized, tasty and flavorful).
  • 30
  • 25
  • 20
  • 15
  • 10
  • 5
  • 0
  • US Beef
  • Domestic Kobe
  • Washugyu

Feeding Period

Outstanding Quality

Over 90%of Kuroushi is graded USDA Prime, significantly more than most U.S. and domestic Kobe beef.

  • 100
  • 80
  • 60
  • 40
  • 20
  • 0
  • US Beef
  • Domestic Kobe
  • Washugyu

Occurance of Prime (%)

Count On Us For Good Ingredients –
And Food Safety

Kuroushi is USDA-approved under the Non-Hormone Treated Cattle (NHTC), High Quality Beef (HQB) programs. That means the most stringent qualifications in food hygiene management.

Order Kuroushi for its good taste, tenderness, and juiciness…knowing you're enjoying one of safest, high quality products in the world.

Brand (Washugyu)


Our Waygu Beef

Our Waygu beef comes from American- bred cattle, using a custom Japanese program that carefully selects superior genetic traits (Tajima Wagyu), cross breeding them with the finest Black Angus cattle. They are raised on a strict feeding program, using the highest quality feed available in the market. We achieved this by recruiting one of the most experienced Japanese Wagyu Breeder/feeder, a man with decades of experience and knowledge, who has come over to the U.S. to develop and monitor these programs.

Since the breeding, feeding and rearing of Wagyu cattle are a closely guarded secret—even in Japan—this knowledge has not been available in the United States, until now. Using this knowledge, and superior feeding programs, we produce a superior product. Beef with marbling and flavor that surpasses any other domestically-produced Wagyu beef currently available in the United States. Unlike U.S. domestic beef, 90% of our Wagyu beef is graded Prime and has a USDA Beef Marble Score (BMS) between of 9 and 10.


Because our program has stricter standards and a higher quality than most domestic beef programs, our Wagyu cattle are certified Non-Hormone Treated Cattle (NHTC) and High Quality Beef (HQB) by the USDA. These certifications demand the highest quality control possible. No hormones or feed additives containing hormones are used in the production of our certified Waygu cattle. The feed our cattle receive is certified as providing them with the energy levels required by the USDA Quality System Assessment (QSA) program. Any time this ration is changed, the USDA re-approves it*.

Our company is 1 out of only 11 Waygu breeders in the U.S. granted these certifications. This combination of breeding, feeding, quality control, and USDA certification, means we can guarantee 100% traceability from ranch to fork. And, our stringent hygiene management controls are among the best in the world, which mean you can comfortably enjoy each bite of our high quality beef.

*When the cattle are exported to the European Union, the paperwork includes documentation of this ration, and proof that they have consumed it for the prior 100 days. Without the NHTC & HQB certification no beef is allowed to be exported to the EU countries.

Feeding Programs

Our 100% vegetarian feeding program consists of an all-natural, high energy grain feed diet. The feeding program starts between 7-9 month old. The calves are introduced to dry rice straw, which strengthens their stomach, allowing them to absorb most of the nutrients from the feed when they are switched to an all-grain diet. The Wagyu cattle are on this feeding program until 27-30 month--far longer than most domestic cattle in the U.S. Greater maturity translates to more flavorful and better marbleized beef.

Typical western cattle are fed on the most inexpensive rations available, and harvested at 20-22 months of age, with the goal of producing a faster, cheaper product. The finished product: less flavorful and marbleized beef.