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#116642 - 06/04/17 06:51 AM Barring on Euskal Oiloa chickens (Basque)
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
Does anyone know for sure if the barring on Euskal oiloa chickens is due to autosomal barring? Or do they have the barring gene? Thanks.

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#116644 - 06/05/17 03:03 AM Re: Barring on Euskal Oiloa chickens (Basque) [Re: Robbie]
dingsda Offline
Bantam

Registered: 09/07/14
Posts: 69
Loc: Germany
from what I see on pictures I would think they have the barring gene. Autosomal barred chicken show a clean silver or golden neck, but the Euskal oiloa are barred all over. The females would show a much more distinctive barring, if autosomal barred.

Would be interesting to learn, why the Euskal oiloa hens have such a faded barring, some actually look like they are not barred at all.

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#116645 - 06/05/17 04:54 AM Re: Barring on Euskal Oiloa chickens (Basque) [Re: dingsda]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2864
Loc: Australia
Yes, mostly eWh Co B

Following 1980 paper (by Campo & Orozco) on test breeding Gold Barred Basque (Euskal Oiloa):
"The action of the sex linked barring gene on Spanish chickens with gold plumage"
https://www.gse-journal.org/articles/gse/pdf/1980/03/AGSE_0003-4002_1980_12_3_ART0002.pdf

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#116646 - 06/05/17 05:15 AM Re: Barring on Euskal Oiloa chickens (Basque) [Re: KazJaps]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2864
Loc: Australia
If it is the same breed /variety as "Vasca Roja Barrada" a Spanish article seems to be saying that Light Sussex and New Hampshire are in their ancestry?
Quote:
Es de doble aptitud (puesta y carne). Aunque al principio se formaron otras tres variedades (Roja, Plateada, y Negra), las dos primeras se eliminaron posteriormente del programa al ser idénticas a la New Hampshire y a la Sussex, que en esos años se cruzaban entre sí para obtener la gallina industrial de huevo marrón. Este cruce, sexado genéticamente con el gen plateado de la Sussex, tenía la desventaja de que era igual a las razas de partida (la hembra comercial igual que la New Hampshire y el macho igual que la Sussex), y podía utilizarse para el re-emplazamiento de las aves.


Spanish to English Google translate:
Quote:
Although they were initially formed three other varieties (Red, Silver, and Black), the two were subsequently removed from the program as they were identical to New Hampshire and Sussex, that in those years they crossed each other to obtain the industrial hen of Brown egg this cross, genetically sexed with the gene Silver from the Sussex, had the disadvantage that it was equal to the races of departure (the commercial female the same as the New Hampshire and the male as Sussex), and could be used for the re-emplacement of the birds.


In PB&G, Smyth notes the following on Vasca (non barred red columbian variety):
Quote:
Vasca. eWh/eWh Co/Co db+/db+ Mh?.
The Vasca, like the Prat, is reported to carry eWh and Co, but adults are darker, resembling the New Hampshire (Campo and Orozco, 1983). Pheomelanin color differences appear to be due to a single gene that is dominant for darker coloration. These workers suggest that this could be due to the presence of different Co alleles, or to some other major modifier (possibly Mahogany (Mh), authors suggestion).


Ref:
J. L. Campo F. & Orozco 1983.
Genetics of the columbian plumage pattern in the Vasca chicken breed.
J Hered (1983) 74 (1): 43-46.
Abstract: https://doi.org/10.1093/oxfordjournals.jhered.a109716

Quote:
The Vasca breed has been described by Campo and Orozco 2'3. It was created in 1975 with some domestic fowl types from the Basque region of North Spain, where it is known as "Eusko-olloa."

Even though they had never been selected as a breed, some have distinctive traits that we are trying to stabilize. Due to its short history as a pure breed, there is some variation in plumage coloration, which ranges from solid mahogany red to yellow-hackled red.


* They note in Vasca mostly eWh Co was found, although chick downs similar to e+ and eb suggested these 2 alleles were segregating in low frequencies.

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#116647 - 06/05/17 07:00 AM Re: Barring on Euskal Oiloa chickens (Basque) [Re: KazJaps]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
Thank you!
The barring in the hens of Marrunda variety is definitely odd, and I was wondering why they looked like that.

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#116649 - 06/06/17 01:16 PM Re: Barring on Euskal Oiloa chickens (Basque) [Re: Robbie]
Shaneb99 Offline
New Egg

Registered: 09/03/14
Posts: 5
Loc: Alberta
What promoted Robbie's question was a post on another forum where someone had crossed a Black Ameraucana rooster over a Marrunda EO hen and got one solid black rooster and one barred rooster. My understanding is that crossing a solid E/E rooster over a B/- hen should produce all single barred B/b males. So what happened?

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#116650 - 06/06/17 01:30 PM Re: Barring on Euskal Oiloa chickens (Basque) [Re: Shaneb99]
Wieslaw Offline
Moderator
Classroom Professor

Registered: 09/18/09
Posts: 3840
Loc: Denmark
There can be several explanations , from most probable, to most theoretical:
1) the egg came in reality from another hen( so called confusion)
2)the rooster is perhaps a female with hormone troubles.
3)the gene was deactivated (methylation, epigenetics)

If it would come from the father, other theoretical explanations could be added, like reversion to b+, or deletion of the entire gene.



Edited by Wieslaw (06/06/17 01:56 PM)
Edit Reason: changed text

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#116651 - 06/06/17 03:58 PM Re: Barring on Euskal Oiloa chickens (Basque) [Re: Wieslaw]
Shaneb99 Offline
New Egg

Registered: 09/03/14
Posts: 5
Loc: Alberta
My theory is the barring on the EO was autosomal not sex linked.

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#116652 - 06/06/17 07:47 PM Re: Barring on Euskal Oiloa chickens (Basque) [Re: Shaneb99]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2864
Loc: Australia
Autosomal barred/transverse barring (Pg-Db) on s+ gold base gives gold and black bars, not gold and white bars as B sex-linked barring does on phaeomelanin. It's harder to distinguish autosomal barred from sex-linked barred on S silver based phaeomelanin.

Autosexing breeds Cambars, Queen Silvias etc have both autosomal barring & sex-linked barring.

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#116653 - 06/06/17 08:05 PM Re: Barring on Euskal Oiloa chickens (Basque) [Re: KazJaps]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2864
Loc: Australia
Note, this Spanish article (article from Spanish chicken research & conservation team) I linked to previously has photos of "Vasca Roja Barrada" (which is the same breed as "Eusko-olloa"). It is quite obvious that these ones are B - sex-linked barred buff columbians, wheaten based (gold & white phaeomelanin, plus black & white eumelanin barring, no autosomal gold & black barring).


Edited by KazJaps (06/06/17 08:08 PM)

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