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PostPosted: Sat Jul 26, 2008 12:14 am 

Joined: 10 Jun 2008
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Hi everybody ,

This topic was put in the arab forum by " Dr. Hassan Salama " so all his rights are reserved .

This is a link to the original text : http://canaryfans.com/forum/viewtopic.php?t=4796" onclick="window.open(this.href);return false;

Some important notes on color mutations :

1- A cockatiel with no cheek patches is called Yellow-face with less Psittacins pigment that is responsible for the orange cheek patches , until the cheek patches turn peach-yellow or blend in the yellow male face . This trait can be inherited in two ways : through autosomal dominant traits Y or recessive sex-linked traits Xy where y indicates the Yellow-face trait . It's genetic origin is determined by parents and grand parents birds .

2- The Pearl trait is sex-linked , where male cockatiels is represented by XP XP and females are represented by XP Y .

3- The Lutino trait is sex-linked , where male cockatiels is represented by XL XL and females are represented by XL Y .

4- The Whiteface trait is an autosomal recessive trait , its formula is ww .

5- The Regular Grey is a dominant trait , its formula is GG .

6- Yellow-face Lutino birds are all colored in yellow with peach-yellow cheek patches .


Question :

What's the result of pairing an Albino ( Whiteface Lutino ) with a Pearl Yellow-face female ( no cheeks ) ?

Answer :

The male genetic formula is XLXLwwyyn ,
In case the female is Yellow-face Pearl so the Yellow face trait is always dominant unless a cross over occurs , so the result will be :
Firstly : If the female is pure YY and GG ( autosomal ) ( grey origins ) with the formula XPGGYY :
- All female birds are Yellow-face Lutino with the genetic formula XLGwYy .
- All male birds are White-face split to Lutino and Pearl with the formula XPXLGwYy . They carry the cheek patches and Whiteface traits as well .

Secondly : If the female is not pure and doesn't carry the White-face trait with the formula XPGGYy :
- All female birds are Lutino , half of them are Yellow-face with the genetic formula XLGwYy and the other half have cheek patches with the formula XLGwYy .
- All males are Normal Grey , half of them are Yellow-face with the genetic formula XPXLGwYy and the other half have cheek patches with the formula XPXLGwyy .

Thirdly : If the female is not pure Grey , carries the White-face trait and doesn't carry the cheek patches trait with the formula XPGwYY :
- All females are Yellow-Face , half of them are Lutino and the other half are Albino .
- Half of the males are White-face with the formula XPXLwwYy , and the other half are Yellow-face with the formula XPXLGwYy .

Fourthly if the female is impure in all cases with the formula XPGwYy: I leave this for u to calculate .

Question :

What is the result of pairing a Yellow-face male with a Normal Grey female ?

Answer :

Firstly : If the Yellow-face trait is a dominant autosomal trait , then the pure male formula will be XXGGYY and the female XGGyy so , all the offspring will be Yellow-face without knowing the gender of the chicks so that male bird will have the formula XXGGYy and female birds will have the formula XGGYy . The impure male formula is XXGGYy so half of the offspring will be Yellow-face as previous and the other half will be Normal Grey , males have the formula XXGGyy and females have the formula XGGyy .

Secondly : If the Yellow-face trait is a recessive autosomal trait , then the male formula will be XyXyGG and the female XYGG – where Y here indicates cheek patches trait - so , female birds will be Yellow-face with the formula XyGG and male birds will be Normal Grey with the formula XyXYGG .

Best wishes and good luck :)




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Breeder: cockatiels
PostPosted: Sat Jul 26, 2008 4:44 pm 
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Thanx, and thousands of thanx.



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Breeder: canaries
PostPosted: Sat Jul 26, 2008 5:37 pm 

Joined: 10 Jun 2008
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Dear brother Abdo Abu Seir ,

You're welcome and I hope everything is alright

Best wishes and good luck :)



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Breeder: cockatiels
PostPosted: Sat Jul 26, 2008 9:58 pm 

Joined: 02 Jul 2008
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Please be aware that Lutino Cockatiel's are more prone to health related problems than other mutations of cockatiels. They are more prone to respiratory problems and blindness. I myself have a 15 years lutino cockatiel who is blind with glaucoma and also struggles with respiratory problems. His condition is untreatable. There is not much you can do for a bird of his size. The surgery alone may be too much for his health and kill him. This is not the case for all lutino cockatiels, but I advise to take extra caution with thier health. Any time something is taken out of nature and mutated, most likely there will be side affects.

Glaucoma:
Ophthalmology. abnormally high fluid pressure in the eye, most commonly caused either by blockage of the channel through which aqueous humor drains (open-angle glaucoma or chronic glaucoma) or by pressure of the iris against the lens, which traps the aqueous humor (angle-closure glaucoma or acute glaucoma).



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Breeder: I do not breed birds, but I care for cockatiels and also volunteer at a bird sanctuary.
PostPosted: Mon Jul 28, 2008 11:16 am 

Joined: 10 Jun 2008
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Hi Lindsay ,

Thank u very much for the information !

Best wishes and good luck :)



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PostPosted: Sun Aug 17, 2008 5:59 pm 
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Hi:
sorry for being not around as i was busy with family.
Thank you Lindsay for these hints.
Could you explain more why are the Lutinos more prone to healthy problems than others ?




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