Cinnamon Budgerigar Mutation, Complete Genetics Guide

A century-old mutation that transformed every modern budgerigar exhibition line. Sex-linked recessive, mediated by the TRP1 gene, expressed as warm brown wing markings instead of black. Cinnamon is one of the foundational genes behind Lacewing, behind classic Opaline Cinnamon exhibition birds, and the textbook example of how to sex chicks at hatch by colour alone.

Written by Ayaan Shohan

Founder, KinBird Aviary · Bangladesh

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What Cinnamon looks like on a real bird

A Cinnamon budgerigar has the same overall colour pattern as a Normal bird of the same base — Light Green, Sky Blue, Cobalt — but the wing markings, throat spots, and tail bars are warm cinnamon brown rather than black. The eyes are plum-coloured at hatch, gradually darkening to near-normal in mature birds. The feet and beak are also slightly lightened.

The mechanism is well documented. The Cinnamon allele disrupts the TRP1 gene (tyrosinase-related protein 1), which is required for the final step of black eumelanin synthesis in feathers. With TRP1 disabled, melanocytes still produce melanin granules but the granules are smaller and chemically incomplete. The bird is not lacking melanin entirely, just unable to make the final dark form.

History and origin

The Cinnamon budgerigar mutation has been recognized in captive flocks since the 1930s. The earliest documented Cinnamon birds appeared in Australian and English aviaries during that decade. Cyril H. Rogers in World of Budgerigars traces the mutation's earliest stable lines to British breeders who recognized it as distinct from the existing Fallow mutation.

By the 1950s Cinnamon was an established exhibition variety, included in WBO classification standards, and recognized as one of the four foundational sex-linked recessive budgerigar mutations alongside Opaline, Ino, and Slate. Today Cinnamon birds appear in nearly every exhibition pairing programme worldwide.

How Cinnamon inheritance works

Cinnamon follows simple sex-linked recessive inheritance on the Z chromosome. In budgerigars, males are ZZ and females are ZW.

A male budgerigar has two Z chromosomes and can be Normal (both Z chromosomes carry the wild-type allele), split Cinnamon (one wild-type, one Cinnamon), or visual Cinnamon (both copies are Cinnamon).

A female budgerigar has only one Z chromosome paired with W. She can only be Normal (her Z has wild-type) or visual Cinnamon (her Z has Cinnamon). There is no split Cinnamon hen. This is why the auto-sex pairing works.

The auto-sex pairing trick

Pair a visual Cinnamon cock with a Normal hen. Every chick inherits one Z from each parent.

Daughters get the cock's Cinnamon Z plus the hen's W. They are ZW with Cinnamon on the Z. Every daughter is visual Cinnamon.

Sons get the cock's Cinnamon Z plus the hen's wild-type Z. They are ZZ with one Cinnamon allele and one wild-type. Every son is split Cinnamon (visually normal).

Any chick showing cinnamon-brown markings is a hen. Any chick showing normal black markings is a cock. This trick is used worldwide by serious budgerigar breeders. The same principle applies to all sex-linked recessive mutations.

Cinnamon Ino crossover and Lacewing

The Cinnamon locus and Ino locus both sit on the Z chromosome relatively close together. During meiosis in male budgerigars, crossing over can produce a recombinant Z chromosome carrying both Cinnamon and Ino alleles linked together.

Offspring inheriting that recombinant Z express the Lacewing phenotype — pale body with brown wing markings and red eyes. This is why Inte Onsman of MUTAVI Research concluded in 2007 that Lacewing is not a separate gene but the recombination product of Cinnamon and Ino on the same Z chromosome. The recombination rate is approximately three percent.

Read the full Lacewing inheritance breakdown in our Lacewing mutation guide.

Cinnamon combinations breeders favour

Cinnamon Opaline is the classic exhibition combination, with Cinnamon-brown wing markings on Opaline's wing-reversal pattern.

Cinnamon Ino on the same Z through crossover produces Lacewing (covered in our dedicated Lacewing guide).

Cinnamon Spangle combines brown markings with Spangle's reverse wing pattern.

Cinnamon Cobalt produces soft brown markings on a deep blue body, popular in pet stock.

Cinnamon Yellow Face on blue series adds yellow face wash to a brown-marked bird.

Cinnamon Grey factor dims the brown markings further into a chalky exhibition phenotype.

Cinnamon vs Fallow, the visual difference

Cinnamon and Fallow are often confused because both produce brown pigmentation. The distinction matters.

Cinnamon is sex-linked recessive (Z chromosome). The brown comes from TRP1 disruption. The eyes are plum-coloured throughout life.

Fallow is autosomal recessive. The brown comes from a different mechanism (partial loss of all melanin). The eyes are bright red.

Inheritance is the practical test. A Cinnamon × Normal pairing produces auto-sex chicks. A Fallow × Normal pairing produces 100% split Fallow offspring with no auto-sex effect. If your test pairing sex-separates the chicks, it is Cinnamon.

Cinnamon pairing predictions in the calculator

The Budgerigar Genetics Calculator handles all Cinnamon pairings automatically including the auto-sex effects and the crossover with Ino producing Lacewing at proper rates.

Common Cinnamon pairings: Cinnamon cock × Normal hen produces auto-sex chicks. Normal cock × Cinnamon hen produces all split sons. Two visual Cinnamons produce all visual Cinnamon offspring. Cinnamon Opaline cock × Normal hen produces Cinnamon Opaline daughters and split sons. Test any pairing instantly at budgerigargenetics.com.

Frequently asked questions about cinnamon mutation

What is the Cinnamon budgerigar mutation?

Cinnamon is a sex-linked recessive budgerigar mutation that replaces the normal black wing markings, throat spots, and tail bars with warm cinnamon-brown pigment. It is caused by a non-functional version of the TRP1 gene on the Z chromosome. Cinnamon was one of the earliest sex-linked recessive budgerigar mutations recognized in captive flocks, with stable lines documented from the 1930s onward.

How is Cinnamon inherited in budgerigars?

Cinnamon follows sex-linked recessive inheritance on the Z chromosome. Male budgerigars (ZZ) can be Normal, split Cinnamon, or visual Cinnamon. Female budgerigars (ZW) can only be Normal or visual Cinnamon. This enables the auto-sex pairing trick where a visual Cinnamon cock × Normal hen produces all Cinnamon visible daughters and all split Cinnamon sons.

What is the difference between Cinnamon and Fallow?

Cinnamon is sex-linked recessive and caused by TRP1 gene disruption. Fallow is autosomal recessive and caused by a different mechanism. Cinnamon birds have plum-coloured eyes; Fallow birds have bright red eyes. The inheritance test is decisive: a Cinnamon × Normal pairing auto-sexes the chicks, while a Fallow × Normal pairing produces 100% split Fallow offspring with no auto-sex effect.

Can a hen be split for Cinnamon?

No. Female budgerigars have only one Z chromosome paired with W. A hen either has Cinnamon on her single Z (visual) or does not (Normal). There is no carrier state for hens with any sex-linked recessive mutation.

What is a Cinnamon Opaline budgerigar?

A Cinnamon Opaline budgerigar carries both mutations visually. The Cinnamon gene turns wing markings warm brown; the Opaline gene rearranges the wing-marking pattern. The combined effect is a soft pastel phenotype popular in exhibition. Because both genes are sex-linked, a Cinnamon Opaline cock × Normal hen produces all Cinnamon Opaline visible daughters and all split sons.

How does Cinnamon produce Lacewing through crossover?

The Cinnamon and Ino loci both sit on the Z chromosome close together. During meiosis in male budgerigars, crossing over occurs at approximately three percent recombination rate. When a cock heterozygous for both Cinnamon and Ino has them on different Z chromosomes, crossing over produces a recombinant Z carrying both alleles together. Offspring inheriting that recombinant Z express the Lacewing phenotype. Inte Onsman of MUTAVI Research concluded in 2007 that Lacewing is not a separate gene but the recombination product of Cinnamon and Ino.

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