In brief
Walk into a steakhouse almost anywhere in the world and you will see “Wagyu” on the menu. Much of it has never been near Japan.
The word has become a general term for heavily marbled premium beef, but the animals behind it differ enormously — in bloodline, in how much of that bloodline is actually Japanese, and in whether any rule requires the label to mean anything at all. Here is how Japanese wagyu, American Wagyu and Australian Wagyu actually relate to each other.
Japan first exported wagyu genetics to the United States in 1976 — four bulls. A second, more significant transfer followed in 1993, including a small number of fullblood animals. In total, only a limited number of cattle and genetic material left Japan between roughly 1976 and 1997 — on the order of a couple of hundred animals.
Every “Wagyu” raised outside Japan today traces back to that narrow window. There has been no comparable outflow since. From 1997 the export of live animals and genetics was effectively halted, and in 2020 Japan passed two laws — on the prevention of unfair competition in livestock genetic resources, and amendments to the livestock improvement law — that treat wagyu genetics as protected intellectual property. Both took effect on 1 October 2020, prompted by a 2018 case of semen and embryos being exported without authorisation.
Inside Japan, the term is defined. Since 2007, only four breeds — Japanese Black, Japanese Brown, Japanese Shorthorn and Japanese Polled — and their crosses, born and raised in Japan and traceable through the national ten-digit individual identification system, may be labelled wagyu. Japanese Black accounts for over 90% of it, according to Japan’s Ministry of Agriculture. This is the standard behind the “Wagyu” unified mark introduced that year. We go through the category, the four breeds and the labelling rules in What Is Wagyu?
Outside Japan, no such definition binds the word. That is the gap this whole article lives in: in Japan “wagyu” is a protected origin term; abroad it is a marketing word for marbled beef.
Australia runs the most rigorous overseas system, through the Australian Wagyu Association, and it grades bloodline by percentage:
So an Australian “Wagyu” steak can be anything from a fullblood animal to one that is half Angus. The label alone does not tell you which — the percentage does. A fullblood Australian animal shares its ancestry with Japanese cattle, but decades of separate breeding, different feed and a different climate make it its own thing.
Grading differs too. Australia uses the AUS-MEAT marble score from 0 to 9+; Japan uses the JMGA BMS scale from 1 to 12. The scales are aligned at the lower end, but Japan’s top three BMS grades all fall into Australia’s single “9+”, so the very top of Japanese marbling has no separate rung abroad.
Worth knowing in both directions: Japan’s own top grade no longer separates much either. 76.6% of steer wagyu now grades A5, so “A5” on a Japanese carcass is closer to a floor than a distinction — see what A5 actually measures.
Most American “Wagyu” is F1 crossbred — Japanese Black bred to American Angus, so roughly 50% wagyu. That is not a criticism of the beef, which can be very good. The issue is the label.
In the United States there is no legal system requiring the wagyu percentage to be disclosed. A menu or a package can say “Wagyu” without stating whether the animal was fullblood, purebred or half Angus. A crossbred steak and a fullblood steak carry the same word at very different prices.
“Wagyu” on a foreign menu tells you the beef is marbled and premium-priced. It does not, on its own, tell you the bloodline percentage, the country of origin, or whether it has any connection to Japan beyond a distant ancestor. If it matters to you, the questions to ask are simple: where was the animal raised, and what percentage wagyu is it?
Japanese wagyu answers both by definition — born and raised in Japan, and, for the black breed, purebred. That verifiability is the real difference. But verifiable origin is not the same as a guarantee of quality: we explain what Japan’s grading actually measures, and the several things it does not, in What Is A5 Wagyu? — and set out the criteria we judge restaurants on in The Standard.
Where we’d actually send you to eat. Our committee dines unannounced, pays its own way, and takes no money from any restaurant. See the selection of Japan’s best wagyu and yakiniku restaurants.