Two things about wagyu are almost universally misunderstood outside Japan. The first is what the A5 grade measures. The second is that Kobe, Matsusaka and Omi are not breeds of cattle — they are brands, with published rulebooks, and the cattle inside them are the same breed as most other wagyu in Japan.
Once those two are straight, buying and ordering wagyu becomes much less mysterious, and considerably cheaper.
What wagyu actually is
Wagyu means Japanese cattle, and in Japan it is a legally restricted term covering exactly four breeds and crosses between them:
- Japanese Black (kuroge washu) — over ninety per cent of all wagyu. Everything you have heard of is this.
- Japanese Brown (akage washu) — from Kumamoto and Kochi. Leaner, more beef-forward flavour, a small but committed following.
- Japanese Shorthorn — from the northeast. Very lean, grass-raised, closer to what most of the world thinks beef tastes like.
- Japanese Polled — from Yamaguchi. Fewer than a couple of thousand animals exist. Effectively a rarity.
Now the distinction that saves money in a Japanese supermarket. Wagyu and kokusan-gyu are not the same thing. Kokusan-gyu — domestic beef — only means the animal spent the longest portion of its life in Japan. It includes retired Holstein dairy cattle and dairy–wagyu crosses. It is often good, and it is a fraction of the price, but a package marked kokusan-gyu is telling you it is not wagyu. If it were, it would say so.
What A5 actually means
This is the one worth reading carefully, because “A5” is used abroad as a synonym for “the best” and it does not mean that.
The grade is two separate assessments bolted together by the Japan Meat Grading Association.
The letter is a yield grade. A, B or C, measuring how much sellable meat comes off the carcass relative to its weight. A is above standard. That is all it is: a measure of butchering efficiency, useful to a wholesaler and of no interest whatsoever to you as an eater. A cut from a B-grade carcass can be identical on the plate.
The number is a quality grade, 1 to 5, and it is judged on four things: marbling, meat colour and brightness, firmness and texture, and the colour and quality of the fat. Crucially, the final number is the lowest of the four scores, not an average. A carcass that scores 5 on marbling and 3 on fat quality is a 3.
Underneath the number sits the marbling scale itself, BMS, running 1 to 12. Grade 5 covers everything from BMS 8 to BMS 12. That is an enormous range. A BMS 8 A5 and a BMS 12 A5 carry the same label and are meaningfully different pieces of meat — and cost very different amounts wholesale.
So: A5 is a real and demanding standard, but it is a statement about carcass yield and visual quality, not about flavour. Nothing in the system measures taste. And more marbling is not linearly better — a great many Japanese diners and a growing number of Japanese chefs prefer A4, or a lower-BMS A5, for a steak, because a very heavily marbled cut is rich enough that most people cannot finish two hundred grams of it. That is why wagyu is traditionally served in small quantities, thin, and often cooked in ways that render fat out: sukiyaki, shabu-shabu, or thin slices on a hot plate.
Practical version: if you are buying wagyu to eat as a steak, A4 is frequently the better buy and always the cheaper one.
Kobe, Matsusaka, Omi: brands, not breeds
Japan has something in the region of three hundred regional beef brands. A brand is a set of published criteria — breed, birthplace, where it was raised, sex, minimum grade, sometimes carcass weight limits — administered by a local council. The cattle are, overwhelmingly, Japanese Black.
Kobe Beef is the strictest and most famous. It requires an animal of the Tajima bloodline of Japanese Black, born and raised in Hyogo Prefecture, slaughtered in Hyogo, a heifer or a castrated bull (never an uncastrated one), a marbling score of BMS 6 or above, a yield grade of A or B, and a carcass weight inside a set range. Only a few thousand animals qualify each year. Every certified carcass has a registration number and the chrysanthemum seal, and a genuine Kobe restaurant will show you the certificate on the wall.
Matsusaka (Mie) is heifer-only and famous for extreme fattening periods. Omi (Shiga) is the oldest of the three, with a documented history back into the Edo period. Together the three are usually called Japan’s big three.
Saga Beef is worth naming because its rulebook is arguably tougher than Kobe’s on quality: Japanese Black raised by farmers in the JA Saga group, requiring BMS 7 or above and a quality grade of 4 or above. It has far less international recognition and costs correspondingly less, which makes it one of the better value propositions in Japanese beef. The same logic applies to Yonezawa, Miyazaki, Hida and Maesawa: excellent brands, thinner marketing budgets, lower prices.
If you want the best beef your money can buy in Japan, do not order Kobe. Order the best brand you have never heard of.
Is Australian or American wagyu real wagyu?
Legitimate question, and the answer is: related, but usually not the same animal.
A small number of wagyu cattle and genetic material left Japan in the 1970s through the 1990s. In 1997 Japan halted live export and designated wagyu genetics a national asset; in 2020 it passed a law specifically to protect livestock genetic resources against unauthorised export. Essentially all wagyu outside Japan descends from that narrow founding group.
Most beef sold abroad as wagyu is a crossbreed — commonly wagyu with Angus — and is labelled by percentage: F1 is fifty per cent, and the ladder runs up to “full blood”, which is a hundred per cent wagyu genetics but bred outside Japan. Full blood Australian wagyu is genuinely wagyu by breed. It is not Japanese wagyu, because the feed, the finishing period and the grading system are all different — Australia uses its own marbling scale, and an “MB9+” is not an A5.
Japanese beef exported officially carries a “Japanese Wagyu” mark and a traceable individual identification number. Every animal in Japan has one, and you can look it up.
The beer and massage story
Mostly myth. A handful of farms have given cattle beer to stimulate appetite during humid summers, and some brush or massage animals — for hide condition and to reduce stress in confined housing, not to redistribute fat, which is not something massage does. The story travelled because it makes good copy. Modern wagyu marbling comes from genetics, a very long fattening period on a controlled grain diet, and low-stress management. It is a breeding and feeding achievement, not a spa treatment.
How to eat it
Sukiyaki — thin slices cooked in soy, sugar and mirin, dipped in raw egg. The egg is not a garnish; it cools the meat and cuts the sweetness, and it is the reason the dish works.
Shabu-shabu — swished in hot dashi for seconds. The most efficient way to enjoy a heavily marbled cut, because a good deal of the fat leaves in the pot.
Teppanyaki — cooked in front of you on a flat plate, typically served in cubes with the fat trimmings crisped separately.
Yakiniku — grilled at the table, cut by cut, which is the best way to learn what the different cuts do. Ask for misuji (top blade) or zabuton if the menu has them.
Portion sizes are small on purpose. A hundred to a hundred and fifty grams of A5 is a full serving, and trying to eat a Western-sized steak of it is a common and expensive mistake.
