Bourke's

[noorreda]

The name of God the Merciful


Hey Every Birdie,


The Opaline mutation versus Fallow mutations in the Bourke's Parakeet




Would they Dun fallow combined with opaline still have the pink feet and red eyes?




When you say DARKER, do you mean a darker shade of pink?

Nope... Darker refers to the tones of the eumelanin produced & most obviously noticeable in areas of plumage displaying foreground eumelanin (produced in flights &/or dark mantle's markings in species such as Bourke's, Budgies &/or Rosella Grass Parakeets displaying this feature)

In simple terms ; dark refers to describe the various tones of the dark pigmented (black, browns, grey-browns (fawns), greys & silvers) feathers &/or of the body aka ground colour (which includes the rump region)

When rather describing or qualifying yellow, orange, pink &/or red psittacin pigmented coloured down &/or feathers ; more appropriate words & their variations such as bright, deep, light, rich &/or soft... are better suited.

I am asking because I see different shades of red eyed pink bourkes being sold as pink at the bird fairs here and now I am wondering if some of them may be dun fallow opalines.

And you are absolutely right on target ! Both the Bronze & Dun Fallow mutations combine with the Opaline mutation to produce very similar phenotypes (appearances)

The Opaline Bronze_Fallow combination is the one & only genuine secondary mutation genetically & internationnaly known as the Pink mutation. This particular secondary mutation is often cka (commonly-known-as) although genetically ika the 'pale Pink type or pale phased Pink' mutation. This precise secondary mutation produces the overall lighter/softer & more golden-yellow-full wing coverted secondary mutation.

Pure (not combined to other mutation(s)) specimens of this precise genotype, display softer violet-blue outter-webs in flights & bent of wings (also ideally in the cocks eye-brows) as well as brown flights & much paler mantle-markings. To the point of the mantle markings being only slightly noticeable underneath the golden-yellow coloured wing coverts in hens while being slightly darker & more obvious in cocks.

The Opaline Dun_Fallow is often cka although genetically ika the 'dark Pink type or dark phased Pink' mutation. This particular secondary mutation produces the overall darker secondary mutation with washed-out golden-yellow wing coverts. Pure specimens of this precise genotype, display darker blue (cobalt-like) outter-webs in flights & bent of wings (also ideally in the cocks' eye-brows) as well as grey-brown flights & much darker, fuller & so much more obvious mantle-markings. With fuller golden-yellow colourations basically restricted to the upper regions of wing-coverts while basically restricted to the outter edges of each lower-wing-covert feathers.

"What would the outcome be if a dun fallow opaline was bred to a bronze fallow opaline?"

Pairing up 2 distinct Fallow mutations (pure &/or in combination with other mutations) is disadvisable & so should be totally avoided as much as Humanely consciently possible.

That being said : to this very day, the pairing up of distinct Fallow mutations throughout Parrot species always produced 100% visual Wild-Type offsprings double split for each Fallow mutations

i.e. WT / bz_Fw / dun_Fw

So pairing up an Op bz_Fw (Pink) to an Op dun_Fw would produce 100% Op / bz_Fw / dun_Fw offsprings because both parents are visual Opaline specimens.

Opaline with extra blue





Are both types of fallow at the same gene location?


To this very day ; genetic investigations & informations tells us that at least 3 if not the whole 4 distinct Fallow mutations (listed below) each have their own Loci (plural of Locus)

The Bronze_Fallow aka Brown_Fallow mutation is so far ; the only Fallow mutation having genetically confirmed itself being a genuine allele of the a-Locus.

However, it has been theorized by Inte Onsman from Netherland's MUTAVI Research & Advice Group (and I personaly beleive the theory to be highly probable) that the Beige_Fallow aka Pale-Brown_Fallow aka Pale_Fallow might possibly a 2nd Fallow allele of the a-Locus (NSL-Ino gene)

Unfortunately though ; it has not yet been possible to test this theory in any Parrot species mostly because of the confusion amoungst proper genetic identities of each species' precise Fallow mutations. Added to the fact that Fallow mutations as a whole are usually quite uncommon to extremelly rare mutations in between distinct countries, regions &/or species and often times even within a single species.

Or would it be possible to have a bird be homozygous for both fallow mutations simultaneously?

Indeed quite possible and although totally disadvized, combinations of Fallow mutations do occur incidently &/or sometimes volontarily.

As with virtually all known colour mutations and provided that the paired-up specimens are as unrelated to each other as possible (in-breeding frequency being the main factor of weaken lineages) ; the problem with combining distint Fallow mutations just as combining any other distinct but similar looking mutations (i.e. Cinnamon X Fallow, Cinnamon X Pallid, Dilute X Fallow, Dilute X Pastel...) is not that the resulting offsprings would be flawed, weak or anything such healthwise related.





But rather that combining distinct mutations with very similar expressions (i.e. both diluting or both incompletely suppressing eumelanin &/or 1 of each type of mutations) produces offsprings usually displaying +/- intermediate phenotypes partway between that of each involved mutations. And so unfitted for the set standards for each colour mutations & so penalized as such by show judges on show benches ; this of course causing much deception & frustration for the exhibitor.

Here's the direct-link to one of the very best writtened article regarding Fallow mutations amoungst Parrot species ;

http://www.birdhobbyist.com/parrotco.../fallow01.html

As you will be able to notice in the Fallow mutations Table available at about 3/4 way down this article ;

The Fallow mutation commonly and invariably known as the 'Cream &/or Yellow' mutation in the Bourke's Parakeet is situated in the Brown_Fallow aka Brown_Fallow section.

The other Fallow mutation, sometimes also known as the 'Yellow' mutation in the Bourke's Parakeet

Last but not least, the Bronze_Fallow mutation is sometimes totally erraneously known as the 'Pastel' mutation amoungst Bourke's Parakeet's hobbysits. This causing totally unecessary confusion because just as the Bronze_Fallow mutation and even though the genuine Pastel mutation is also an autosomal-Incomplete-Albinistic aka Part-Ino or Parino for short ; by genetic definition & according set standard ; the genuine Pastel mutation displays GREY flights & NATURALLY coloured eyes, feets (skin) & toe nails.

The genuine Pastel mutation is another allele of the a-Locus (NSL-Ino gene) symbolized as a*pa alongside the Bronze_Fallow mutation (symbolized as a*bz), the Dark-Eyed-Clear mutation (symbolized as a*de), the NSL-Ino mutation (symbolized as a*a) & very possibly the BrownWings (which only occured in Budgies so far) and if ever genetically proven to be allelic to the a-Locus ; would be by then symbolized as a*bw.

Opaline fallow hen and cock










Best regards

[almomaiaz]

Thank you and rest is in the Arabic
فعلا موضوع جدا رائع استاذ نور وشامل للطفراة

بارك الله فيك

واتمنى انك ما تستخدك كلمة اله

[Tiki]

Salaam aleykum wa ahlan wa sahlan! Bourkes Parrots helwa awi awi!! Shokran! Tabaan kitheer minhoom fi Australia!

[almomaiaz]

ههههههههههههههههههه

وعليكم السلام ورحمة الله وبركاته

اهلا فيك يا تيكي انا على بالي مافي احد يتكلم عربي

طلعت تعرف تتكلم عربي يالف مرحبا فيك

[Tiki]

Shokran, ya Almomaiaz! Bas ana la atakellam Arabi zein, shwaya shwaya bas! Inta men fein?

[almomaiaz]

ana mn Saudi Arabia-Jeddah

ana arab Birds

hosn BBbgaouat