Kobe beef (神戸ビーフ, Kōbe bīfu) is Wagyu beef from the Tajima strain of Japanese Black cattle, raised in Japan's Hyōgo Prefecture according to rules set out by the Kobe Beef Marketing and Distribution Promotion Association. The meat is a delicacy, valued for its flavor, tenderness, and fatty, well-marbled texture. Kobe beef can be prepared as steak, sukiyaki, shabu-shabu, sashimi, and teppanyaki. Kobe beef is generally considered one of the three top brands (known as Sandai Wagyu, "the three big beefs"), along with Matsusaka beef and Ōmi beef or Yonezawa beef.
Japan was effectively isolated from the rest of the world from 1635 until 1854; there was no possibility of intromission of foreign genes to the cattle population during this time.
Between about 1900 and 1910 there was extensive cross-breeding of these with native stock. From 1919, the various heterogeneous regional populations that resulted from this brief period of cross-breeding were registered and selected as "Improved Japanese Cattle".
Four separate strains were characterized, based mainly on which type of foreign cattle had most influenced the hybrids, and were recognized as breeds in 1944. These were the four wagyū breeds, the Japanese Black, the Japanese Brown, the Japanese Polled and the Japanese Shorthorn.: 8 
In 2009, the USDA placed a ban on the import of all Japanese beef to prevent the Japan foot-and-mouth outbreak from reaching US shores. The ban was relaxed in August 2012 and thereafter Kobe beef was imported into the US.
Kobe beef in Japan is a registered trademark of the Kobe Beef Marketing and Distribution Promotion Association (神戸肉流通推進協議会, Kōbeniku Ryūtsū Suishin Kyōgikai). It must fulfill all the following conditions:
- Tajima cattle born in Hyōgo Prefecture
- Farm feeding in Hyōgo Prefecture
- Heifer (a female that has not given birth) or Bullock (steer or castrated bull)
- Processed at slaughterhouses in Kobe, Nishinomiya, Sanda, Kakogawa, or Himeji in Hyōgo Prefecture
- Marbling ratio, called BMS, of level 6 and above
- Meat quality score of 4 or 5, yield grade A or B
- Carcass weight of 499.9 kg or less.
Kobe beef is expensive, partly because only about 3,000 head of cattle may qualify as Kobe per year. In Japan, all cattle, including those approved as Kobe beef, can be tracked via a 10-digit number through every step of their entire life cycle.
Kobe beef was not exported until 2012. It was exported in January 2012 to Macau, then to Hong Kong in July 2012. Since then, exports have also been made to the United States, Singapore, Thailand, the United Kingdom and Canada.
In some countries, including Canada, the United Kingdom and the United States, Wagyu cattle imported from Japan are farmed, either purebred or cross-bred with other beef breeds such as Aberdeen Angus. In some places meat from these cattle may be marketed under names such as "Kobe-style beef"; it is not Kobe beef, and does not fulfil the requirements for certification of the authentic Japanese product. Due to a lack of legal recognition of the Kobe beef trademark in the United States, it is also possible to sell this meat as "Kobe beef". The Kobe Beef Marketing and Distribution Promotion Association planned to publish pamphlets about Kobe beef in foreign languages.
American "Kobe-style" beef tends to be darker and stronger-tasting than the authentic product. It may have more appeal to Western palates unfamiliar with the mild taste and high fat content of true Kobe beef.
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