One gene can paint the whole rabbit white — without touching a single color gene.

Five words specific to this locus — the rest carries over from Genetics 101.

• V locus — the address on the chromosome for the Vienna gene. It's independent of the A–E color system; think of it as a dimmer switch wired in front of all five, not a sixth member of that circuit.
• Epistatic — a gene that masks or overrides genes at other loci. Vienna is epistatic the same way albino (cc) is: two copies hide the rabbit's true color underneath a coat of white.
• Vienna carrier (VC) — a Vv rabbit that shows no visible sign of carrying the gene. Looks and shows exactly like a VV rabbit.
• Vienna marked (VM) — a Vv rabbit that does show a sign of it: a white blaze or toe, a patch out of place, or one or two blue or marbled eyes, on an otherwise normally colored coat.
• Blue-eyed white (BEW) — the vv rabbit. Solid white coat, blue eyes, every other color gene fully masked underneath.

Every color a rabbit can be starts the same way in the womb: pigment cells called melanoblasts form near the developing spinal cord and migrate outward across the body, eventually settling in skin, hair follicles, and the eye. A normal rabbit's melanoblasts complete that migration everywhere they're needed. Vienna interferes with it.

In a vv rabbit, pigment cells either fail to migrate to most of the body or don't survive the trip, leaving hair follicles with no pigment-producing cells to color them — hence solid white, regardless of what the A–E genes underneath are set to. The eye is a partial exception: enough pigment cells persist in the eye's inner layer that light scatters back as blue rather than the pink of a true albino, whose absence of pigment is total.

Same locus, three very different outcomes — and one of them is a coin flip every time.

Textbook recessive genes are quiet in one copy and loud in two — Aa looks exactly like AA. Vienna breaks that rule. Because expression in the heterozygous state is unpredictable rather than absent, two full littermates that are both genetically Vv can look completely different: one grows up looking and showing like an ordinary rabbit, the other doesn't — and there's no way to tell which you're getting from the genotype on paper alone.

Vienna carrier vs. Vienna marked, defined

Both terms describe the exact same genotype, Vv — one copy of the gene. What differs is whether that copy happens to visibly express:

• Vienna carrier (VC) — a Vv rabbit with no visible sign of it at all. No white patches, no eye change, nothing a person or a judge can see. It looks and shows exactly like a VV rabbit with zero copies of the gene. The only way to know it's carrying v is through pedigree history or breeding results — never by looking at it.
• Vienna marked (VM) — a Vv rabbit where that single copy does show through: a white section you can visibly see (a blaze, a patch, a white toe or two) and/or one or two blue or marbled eyes, sitting on an otherwise normally colored coat. The genotype is identical to a VC's — Vv — the only difference is that this individual's copy happened to express.

Same genotype, two different outward results, and no way to predict which one a given Vv kit will be before it's born.

Coming from Vienna lines doesn't mean a rabbit carries it

This is worth separating out clearly: pedigree history and genotype are two different questions. A rabbit descending from a known Vienna carrier or BEW doesn't automatically inherit the gene itself — inheritance is a coin flip at every single generation, not a permanent stain that passes to every descendant. A Vv parent passes v to roughly half of its kits and V to the other half. Pair that kit to a VV rabbit, and its own kits face the same 50/50 split all over again. By the time you're a few generations removed from the original carrier, it's entirely possible — even likely — that a given individual inherited V at every one of those coin flips and carries no copies of v at all.

So "this rabbit comes from Vienna lines" describes what's possible in the pedigree, not what that individual rabbit actually inherited. The only ways to know a specific rabbit's real genotype — VV, Vv, or vv — are to look at what it visibly shows (a BEW is unmistakably vv; a VM is confirmed Vv) or to rely on documented test-breeding results. A rabbit with Vienna somewhere in its background that has never itself produced a BEW, VM kit, or been proven otherwise is not automatically assumed to carry it — but it also can't be assumed clear, which is exactly why the history gets tracked and disclosed rather than ignored.

A white spot or blaze isn't automatically a Vienna mark, either — a Dutch-pattern influence or simple broken (En) spotting bleeding into an unusual spot can look similar. A blue or marbled eye on an otherwise colored rabbit is the more reliable tell, since neither broken nor Dutch patterning changes eye color on their own.

Keep Vienna lines separate — this is not optional

A Vienna-lined rabbit should never be bred into a standard-color program that isn't deliberately tracking it. This is the single most important management rule for this gene, and it deserves to be stated plainly: because a carrier can be completely invisible, the gene does not announce itself when it enters a line. It can move through litter after litter, generation after generation, with every single rabbit along the way looking and showing exactly as it should — no blaze, no eye change, no warning of any kind.

Then, often years later and usually without warning, two rabbits that both happen to carry a hidden copy get paired — sometimes without the breeder even realizing they share that ancestry — and a line built carefully over years suddenly starts producing unshowable BEW or Vienna-marked kits with no obvious explanation. By that point the gene isn't an isolated, manageable thing anymore. It's already distributed through pedigrees that were believed to be clean, and there is no way to breed it back out short of identifying and removing every carrier — which, since carriers are invisible, may not even be fully possible. A single uncontrolled cross is enough to compromise years of careful color and type work in a show line. If Vienna is going to be part of a breeding program, it has to be brought in on purpose, kept in its own clearly tracked line, and never allowed to cross into rabbits that aren't specifically part of that plan.

Ordinary Mendelian math once you know the genotype — the hard part is knowing it in the first place.

Percentages are population averages across many litters, the same way a coin isn't guaranteed to land 50/50 in four flips. A small litter can land anywhere within the odds.

The name "Vienna" shows up twice in rabbit genetics and it's worth untangling. The Vienna rabbit is a breed, developed in Austria around the turn of the 20th century, bred specifically to fix the blue-eyed white trait — which is where the gene borrowed its name. That breed also comes in solid colors, including a dark slate-blue variety called Blue Vienna.

Blue Vienna is not a blue-eyed white. It's a normally colored rabbit (VV or a non-expressing Vv) that additionally carries the dilute allele (dd) at the completely separate D locus covered in Genetics 101 — the same dilution that turns a Holland black into a blue. The breed name overlaps; the genetics don't. In fact, Blue Vienna rabbits were part of the reference panel researchers used to confirm MLPH as the gene responsible for rabbit dilution in the first place — useful proof that Vienna (the coat-masking gene) and dilute (the pigment-softening gene) are independent loci that happen to share a breed name.

Under the current ARBA Standard, Holland Lops are shown in a White group with two recognized varieties: Ruby-Eyed White (cc, the albino locus) and Blue-Eyed White (vv). A well-typed BEW competes exactly like any other recognized color.

Vienna carriers (VC) are fully showable. A VC rabbit looks like, and is judged as, whatever color it is — there's nothing on the table for a judge to see that would set it apart from a rabbit with zero copies of the gene, because there isn't anything to see. Carrier status has no effect on eligibility.

Vienna-marked (VM) is a different story. A white blaze, odd toe, or off eye color on an otherwise colored rabbit falls outside every recognized variety description and is a disqualification on the table — the same outcome as an unrecognized color. A VM rabbit can still make an excellent pet or a useful piece of a planned BEW breeding project; it simply can't be shown as the color it appears to be.

Genes in the MITF family don't only build pigment cells — the same cells are involved in the inner ear, which is why several species with MITF-driven white spotting (dogs, cats, horses, cattle, and others) show a documented, elevated risk of congenital sensorineural deafness tied to those genes, particularly in fully white, blue-eyed individuals. A 2015 review of deafness genetics across domestic animals names rabbits alongside dogs, cats, horses, cattle, pigs, sheep, ferrets, mink, and camelids as species carrying this same family of pigmentation-linked deafness genes. But a dedicated, published study measuring hearing outcomes specifically in blue-eyed white rabbits doesn't yet exist the way it does for cats and dogs. That's a real gap, not a clean bill of health — the honest position is that the risk is plausible by analogy across species and unconfirmed by rabbit-specific data.

In practice, that means disclosing Vienna carrier and BEW status to buyers even generations back, the same standard applied to broken and dwarf. It also means being cautious about pairing choices — many breeders pair a BEW to a solid-colored carrier rather than BEW × BEW, for the same type-management reasons broken is paired to solid, so a single masking gene doesn't concentrate further in a line generation after generation. And it means treating unproven claims about the gene — deafness, blindness, temperament — with the same honesty as everything else on this page: state what's known, what's assumed by analogy to other species, and what's still unverified in rabbits specifically.

The Vienna questions we hear most, answered straight — and yes, most of these bust a common myth. Tap a question to open it.

Breed standard and show status checked against the HLRSC and published ARBA standard text. Molecular genetics checked against peer-reviewed research; candidate-gene claims are flagged as such rather than presented as confirmed causal findings.

1. Boswell K. Holland Color Genetics. HLRSC Guidebook, 7th ed., 2018. Link — Vienna gene notation, carrier/marked distinction, pairing guidance.
2. ARBA Standard of Perfection — Holland Lop breed standard, recognized varieties, disqualifications. Link
3. Castle WE. Genetics of the Vienna White Rabbit. Science, New Series, 55(1419), 1922, pp. 269–270. Link — earliest formal genetic description of the Vienna white trait.
4. Fontanesi L, Scotti E, Allain D, Dall'Olio S. A frameshift mutation in the melanophilin gene causes the dilute coat colour in rabbit (Oryctolagus cuniculus) breeds. Anim Genet, 45, 2014, pp. 248–255. Link — confirms MLPH as the dilute locus; Blue Vienna rabbits used in the reference panel.
5. Wang G, et al. Analysis of MC1R, MITF, TYR, TYRP1, and MLPH Genes Polymorphism in Four Rabbit Breeds with Different Coat Colors. Animals, 11(1), 2021, 81. Link — MITF sequence variation documented directly in rabbit breeds.
6. Ballan M, et al. Population genomic structures and signatures of selection define the genetic uniqueness of several fancy and meat rabbit breeds. J Anim Breed Genet, 2023. Link — signature of selection at MITF in a rabbit fancy breed's coat-color trait.
7. Strain GM. The Genetics of Deafness in Domestic Animals. Front Vet Sci, 2(29), 2015. Link — cross-species review naming rabbit among species carrying MITF-family, pigment-linked deafness genes; notes rabbit-specific hearing studies remain undone.
8. Fontanesi L, et al. Rabbit Genetic Resources Can Provide Several Animal Models to Explain at the Genetic Level the Diversity of Morphological and Physiological Relevant Traits. Applied Sciences, 11(1), 2021, 373. Link — overview of rabbit pigmentation loci and the candidate-gene process used to identify them.
9. Vienna rabbit. Wikipedia, citing British Rabbit Council breed standards. Link — breed origin and BRC/ARBA recognition status, cross-checked against the ARBA Standard above.