Why a DNA test sometimes doesn't show the expected split

09/07/2026

Why does a DNA colour mutation test sometimes not show the expected split? Discover how different genetic variants can cause the same colour phenotype.

Why a DNA test sometimes doesn't show the expected split

A DNA test for colour mutations is today one of the most powerful tools for the modern parrot breeder. With a reliable genetic test you pair more precisely, identify true splits (carriers) and avoid needless test breeding and guesswork. This lets you better assess the genetic value of your birds and saves you time, space and money.

At NeorniLab we think it matters not only to deliver correct results, but also to explain clearly what a DNA test actually examines. That prevents misunderstandings and helps you interpret the results correctly.

We don't test for a "blue gene": several mutations can produce the same colour

A common misconception is that a single "blue gene", "ino gene" or "cinnamon gene" exists. In reality, genetics works differently.

The same colour phenotype can be caused by different genetic variants (in practice called "mutations") on the same gene (the locus). These variants can differ genetically, while producing exactly the same colour outwardly.

Een eenvoudig voorbeeld van zo'n varianten:

A simple example of such variants:

blue1 in the Red-breasted Parakeet (Psittacula alexandri) → produces the blue colour
blue2 in the Red-breasted Parakeet (Psittacula alexandri) → likewise produces the blue colour

A bird that is blue1/blue1, blue2/blue2 or even blue1/blue2 (compound heterozygote) can show the same blue phenotype. To the breeder these birds look identical. Genetically, however, they differ.

That is why at NeorniLab we always refer to specific mutations, for example:

blue1, blue2, blue3, …
NSL ino1, NSL ino2, …
SL ino1, SL ino2, …
opaline1, …
cinnamon1, …

This is not a complete list. As new mutations are discovered, we keep expanding our range of tests

Why do my birds test "wildtype" when I'm certain there's a split?

This is fortunately rare, but it can happen. Suppose that within a given species blue1 and blue2 are currently known. Your stock, however, carries an as-yet undiscovered blue3 mutation.

When we test for blue1 and blue2, a bird with blue3 will be reported as wildtype for blue1 and blue2, simply because this genetic variant is not yet known or validated. That does not mean the test is wrong. It means the bird carries none of the currently known mutations it was tested for. The result therefore remains fully correct for the mutations examined.

How often does this happen? Fortunately very rarely. For many species the most important colour mutations are known by now, and we can detect virtually all occurring variants. New mutations also do not arise constantly. The appearance of a completely new genetic variant is a relatively rare event. Still, genetics keeps evolving. Now and then a new mutation is discovered somewhere in a bloodline.

That is precisely why NeorniLab keeps investing continuously in research.

When your bird tests split, you know it carries the mutation tested for.
When your bird tests wildtype, you know the mutation tested for was not detected.
And when your breeding results still point strongly to yet another genetic cause, we're glad to look into it together with you.

What do we do when a new mutation is suspected?

Here lies one of NeorniLab's greatest strengths.

When a breeder has strong indications that an unknown mutation is present, we set to work on it in a targeted way.

For example, when:

a given pairing is certain to be expected to produce splits;
reliable reference birds are available for a species for which we don't yet offer tests;
a mutant sent in with the sample nonetheless returns a wildtype result.

In such cases we request reference material where possible. With these references we can carry out targeted genetic research to determine whether a new mutation is indeed present. When this is confirmed, developing and validating a new DNA test becomes a high priority for us.

That is how, step by step, we keep expanding our knowledge and our range of tests.

Our advice: test smart, not blind

DNA tests are valuable, and they are at their most powerful when you use them strategically. The most efficient approach is to first establish which mutation is present in your bloodline. You do this by having a mutant bird (blue, ino, cinnamon, opaline) screened, or by having the first potential splits tested for all currently known mutations for that colour (for example blue1 and blue2).

Once it is known which mutation occurs in your stock, you can have all subsequent birds tested precisely for that mutation, in a targeted and cost-efficient way. That not only saves money, but also gives maximum certainty for your further breeding planning.

It is also advisable to buy tested splits with a NeorniLab certificate. That way you know immediately which mutations you are bringing into your breeding stock, and therefore which ones to test for in the offspring.

In racing pigeons and in DNA sexing, a certificate on sale has become a matter of course by now; with colour mutations too it offers both parties certainty. If you sell yourself, you supply the certificate with the bird; if a buyer has doubts, they verify it through the certificate checker on our website.

Transparency builds trust

At NeorniLab we always test for the genetic variants that have been scientifically demonstrated and validated. We don't promise that an unknown mutation never exists anywhere.

What we do promise is that:

we keep expanding our range of tests as new mutations are discovered;
we take suspicions of new mutations seriously;
and we keep investing, together with breeders, in further unravelling the genetics behind colour mutations.

It is precisely this collaboration between breeders and laboratory that allows us to discover new mutations and ultimately make them available as a reliable DNA test.

That is how, together, we build ever more complete genetic insight, with the aim of better breeding results, less uncertainty and maximum confidence in every DNA analysis.

Unsure which colour mutation test suits your birds?

Send us information about your species, bloodline, expected inheritance and any mutant or potential-split birds. We'll then help you choose which test is most useful for your breeding stock.

Why a DNA test sometimes doesn't show the expected split

Why a DNA test sometimes doesn't show the expected split

We don't test for a "blue gene": several mutations can produce the same colour

Curious which colour mutations we already test for?

Why do my birds test "wildtype" when I'm certain there's a split?

What do we do when a new mutation is suspected?

Our advice: test smart, not blind

Transparency builds trust

Unsure which colour mutation test suits your birds?

Curious which mutations occur in your bloodline?

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