Hi Guys,
This might seem like a really dumb question, but I've seen everyone talking about double factor and single factor with regards to gouldians..
What does this actually mean?? :)
Keen to know, as we've got quite a few of them and plan to breed etc!!
Cheers!
Venetta and Kylie
Double Factor/Single Factor
- Simba
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A Cock bird has two sex chromosones (ZZ) and a hen one (Z) chromosone and one (W) chromosone (ZW).
A colour like yellow back is called sex linked and acts on the Z chromosone only and not the W chromosone.
So if a hen has the yellow colour on it's Z chromosone then it will be visually Yellow back. (Hens can not be DF)
If a cock only has the yellow colour on one of his Z chromosones then he is SF Single Factor, if he has yellow on both his Z chromosones then he is DF Double Factor.
Purple breasted Cock Gouldians SF Yellow will have a dilute green back and a DF Yellow will have a complety yellow back.
White breasted Cock Gouldians SF Yellow will have a yellow back with a blue ring around the head, a DF will have a more intense yellow back and a white ring around the head.
Have a play around with this gentic forcaster it might help:
http://www.ikhom.com/phpBB3/birds_manua ... cies_id=29" onclick="window.open(this.href);return false;
A colour like yellow back is called sex linked and acts on the Z chromosone only and not the W chromosone.
So if a hen has the yellow colour on it's Z chromosone then it will be visually Yellow back. (Hens can not be DF)
If a cock only has the yellow colour on one of his Z chromosones then he is SF Single Factor, if he has yellow on both his Z chromosones then he is DF Double Factor.
Purple breasted Cock Gouldians SF Yellow will have a dilute green back and a DF Yellow will have a complety yellow back.
White breasted Cock Gouldians SF Yellow will have a yellow back with a blue ring around the head, a DF will have a more intense yellow back and a white ring around the head.
Have a play around with this gentic forcaster it might help:
http://www.ikhom.com/phpBB3/birds_manua ... cies_id=29" onclick="window.open(this.href);return false;
Last edited by Simba on 13 Nov 2011, 20:32, edited 1 time in total.
Breeder of Gouldian Finches
- venetta
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Does being single factor actually affect the colour??
Like will the male be a yellow back if he is only single factor??
I learnt genetics a little while studying Animal Care, but that was YEARS ago... lol
Like will the male be a yellow back if he is only single factor??
I learnt genetics a little while studying Animal Care, but that was YEARS ago... lol
Venetta and Kylie
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The terms refer to European yellow,also called yellow back.
The gene is on the sex chromosomes and is co dominant with normal. Birds are back to front with males having two z chromosomes hens a z and a w. if a cock has one yellow gene and one normal gene (one on each chromosome) it is partially yellow ie dilute green and is called single factor. The cock with two yellow genes is yellow and double factor. Because a hen can only have a normal or yellow gene (because it only has one z chromosome) it is yellow even though a single factor.
Im away at present so can't post pics do a google search for gouldian Belgium and you'll find a site with really good pics.
The gene is on the sex chromosomes and is co dominant with normal. Birds are back to front with males having two z chromosomes hens a z and a w. if a cock has one yellow gene and one normal gene (one on each chromosome) it is partially yellow ie dilute green and is called single factor. The cock with two yellow genes is yellow and double factor. Because a hen can only have a normal or yellow gene (because it only has one z chromosome) it is yellow even though a single factor.
Im away at present so can't post pics do a google search for gouldian Belgium and you'll find a site with really good pics.
- Simba
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- Location: Gold Coast, QLD
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I think this is the site natamambo is refering to:natamambo wrote: Im away at present so can't post pics do a google search for gouldian Belgium and you'll find a site with really good pics.
http://users.skynet.be/fa398872/engoulm34.htm" onclick="window.open(this.href);return false;
Breeder of Gouldian Finches
- Diane
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- Location: Northern 'burbs of Adelaide
Try this forecaster too, can be used offline
http://clientes.netvisao.pt/carlmato/" onclick="window.open(this.href);return false;
below is another online one
EDITED.....correct link in here now....
http://www.amadinagouldove.cz/gouldian- ... e/english/" onclick="window.open(this.href);return false;
also some light reading for you.
http://www.finchinfo.com/genetics/lady_ ... /index.php" onclick="window.open(this.href);return false;
http://clientes.netvisao.pt/carlmato/" onclick="window.open(this.href);return false;
below is another online one
EDITED.....correct link in here now....
http://www.amadinagouldove.cz/gouldian- ... e/english/" onclick="window.open(this.href);return false;
also some light reading for you.
http://www.finchinfo.com/genetics/lady_ ... /index.php" onclick="window.open(this.href);return false;
Diane
The difference between Genius and Stupidity is, Genius has it’s limits
The difference between Genius and Stupidity is, Genius has it’s limits
- Simba
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venetta wrote:I think my eyes are officially going to fall out of my head and then my head will explode
The best thing is to use the forcasters and play around witht the different options.
Breeder of Gouldian Finches
- finchbreeder
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I think Simba"s way of explaining it is one of the most straightforward I have read.
LML
LML
LML