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#114363 - 05/12/15 08:20 PM polydactyly and polyphalangy
Robbie Offline
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Registered: 01/19/15
Posts: 258
Loc: Ontario Canada

I got some extra "free" chicks from a custom hatcher (I had Buckeye eggs custom incubated). I have no idea what breed(s) the free chicks are. Another chick in the mix has perfect 5 toed feet. I am hoping for a dorking mix but it's probably a silkie cross....
I hope the pictures will show up in this post.

This chick arrived with curled toes and could barely walk. I used the bandaid/duck feet method to uncurl his feet and straighten his toes. Day 1, I taped the feet as flat as I could. By the next day they had uncurled. I then used rolled up bandaid pieces to straighten out the toes that were still bent. I didn't take a "before " picture but if you can imagine the feet curled up like a fist, that's what they looked like. He was walking on his knuckles. I gave all the chicks a vitamin/electrolyte mix in their water.
The feet were straightened out in about 36 hours, so I suspect the curled feet were due to Riboflavin deficiency.

He seems fine now, he's four days old and he runs around and scratches without problems. He doesn't have any back toe so he's duck footed.... so perching might be an issue later.
If you look closely, the 2 back toes on the left foot are fused; on the right foot, the back toe has a double claw at the tip. The other toes are somewhat normal.
[img:left]http://poultrytheme.poultryswapontario.net/attachment.php?thumbnail=2533[/img]
[img:left]http://poultrytheme.poultryswapontario.net/attachment.php?thumbnail=2534[/img] [img:left]http://poultrytheme.poultryswapontario.net/attachment.php?thumbnail=2535[/img]

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#114366 - 05/13/15 09:13 AM Re: polydactyly and polyphalangy [Re: Robbie]
Henk69 Offline
Moderator
Classroom Professor

Registered: 02/13/06
Posts: 3208
Loc: Netherlands
The images are not publicly available?

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#114367 - 05/13/15 03:31 PM Re: polydactyly and polyphalangy [Re: Henk69]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
I'm not sure what you mean by publicly available.? Anyone is free to use them though if they want.

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#114368 - 05/13/15 04:00 PM Re: polydactyly and polyphalangy [Re: Robbie]
Redcap Offline
Ruler of the Roost

Registered: 08/14/06
Posts: 954
Loc: Germany
The pictures are restricted to registered users of this forum, as the poster (You) uploaded it to the Forum server instead to an extern upload site.
_________________________

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#114370 - 05/14/15 05:00 AM Re: polydactyly and polyphalangy [Re: Redcap]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
Where can I find out how to fix this? thanks.

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#114373 - 05/14/15 12:28 PM Re: polydactyly and polyphalangy [Re: Robbie]
Henk69 Offline
Moderator
Classroom Professor

Registered: 02/13/06
Posts: 3208
Loc: Netherlands
There is a sticky topic about posting pictures

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#114378 - 05/15/15 03:05 PM Re: polydactyly and polyphalangy [Re: Henk69]
Marina Offline
Chicken

Registered: 05/11/11
Posts: 91
Loc: New Zealand
Even without seeing the pictures I'm pretty sure I understand what you mean.
I've got Faverolles and had Silkies. If you cross them with a 4-toed breed the offspring are split for the 5th toe gene. Although the 5th toe gene is dominant, in my crossbred chicks I had all kinds of misshapen 5th toes. Some like you describe but mostly the 5th toe didn't point upwards as it should but was almost flat on the ground.
The curled up toes would indicate that the conditions in the incubator were not ideal, either, which can also affect the development of the 5th toe, especially if the chick is het.

I found that these misshapen 5th toes are a good indicator whether chicks are het or hom for 5th toe. Once they are hom problems diminish significantly.

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#114380 - 05/15/15 07:20 PM Re: polydactyly and polyphalangy [Re: Marina]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
Marina I am sorry I haven't had time to figure out how to upload the pictures just yet, but I plan to fix the picture posting problem.
Thankfully, this chick was the only one that had curled toes out of the 22 chicks I received. Everything seems fine now except for the odd looking toes.

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#114381 - 05/15/15 07:44 PM Re: polydactyly and polyphalangy [Re: Robbie]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
Hopefully the pictures from photobucket are here: I apologize for the large photos, I'll work on that next.

Toes being straightened with band aids:



Toes fixed!

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#114443 - 06/04/15 03:23 PM Re: polydactyly and polyphalangy [Re: Robbie]
Wieslaw Offline
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Classroom Professor

Registered: 09/18/09
Posts: 3769
Loc: Denmark
A new publication on polydactyly(abstract):

http://www.ncbi.nlm.nih.gov/pubmed/26003297

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#114450 - 06/05/15 06:39 AM Re: polydactyly and polyphalangy [Re: Wieslaw]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
There is a brief description of the Bejing You mentioned in that publication in Sigrid Van Dort's book, Genetics of the Chicken Extremes. It's a very late maturing broiler breed, with leg feathers, beard, tassel (?), single comb, and some have five toes.

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#116648 - 06/05/17 08:50 AM Re: polydactyly and polyphalangy [Re: Robbie]
Robbie Offline
Flock Leader

Registered: 01/19/15
Posts: 258
Loc: Ontario Canada
Here's a new paper on polydactyly in the Bejing Fatty.
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0176113

Genetic pattern and gene localization of polydactyly in Beijing fatty chicken

Chuan He,
Yongcan Chen,
Kaixuan Yang,
Zhengxiao Zhai,
Wenjing Zhao,
Shuyun Liu,
Jinmei Ding,
Ronghua Dai,
Lingyu Yang,
Ke Xu,
Zhenxiang Zhou,
Caiju Gu,
Qizhong Huang ,
He Meng

PLOS

Published: May 10, 2017
https://doi.org/10.1371/journal.pone.0176113


Abstract: Polydactyly, a common heritable limb malformation in vertebrates, is characterized by supernumerary digits. In chickens, basic characteristics and rough dominant genes have been explored in past decades; however, the elaborate pattern of inheritance and the determinant gene remain obscure. In this study, different types of polydactylism were classified by the numbers and the shapes of toes, including the newly defined subtypes of B and G, for the Beijing fatty chicken, a native breed of chicken from China. Through experiments on hybridization, we demonstrated a complete dominant inheritance of polydactyly instead of an incomplete penetrance or genetic modification of the previous conjecture. In particular, by using the F2 population of the five-digit purebred line of Beijing fatty chicken backcrossed to Shiqiza chicken and by using restriction-site associated DNA based markers, we performed a genome-wide association study on the trait of polydactyly. Furthermore, whole genome resequencing strategy was applied to sweep SNPs across the whole genome. An outlier-based Fst approach was employed to search for signatures of selection, and results indicated that the determinant mutation was found in the region ranging from 8.3 Mb to 8.7 Mb, where the polydactyly candidate gene LMBR1 was located. The G/T mutation of rs80659072 was identified to be highly associated with polydactyly in our resequencing and was validated in random samples from an expanded population. Thus, we confirmed that LMBR1 was the causative gene of polydactyly in the Beijing fatty chicken by using GWAS with restriction-site associated DNA based markers and resequencing.

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#116655 - 06/06/17 09:46 PM Re: polydactyly and polyphalangy [Re: Robbie]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2807
Loc: Australia
Thank you Robbie. I'll put a link in the journal papers ref. thread too.

That has the Po Chinese (& Sultan?) mutation covered. Unfortunately I don't think they DNA tested the Po European allele (Houdan, Faverolle, Dorking)?

eg, previous 2016 Po study:

Zhang, Z., Nie, C., Jia, Y., Jiang, R., Xia, H., Lv, X., Qu, L. (2016).
Parallel Evolution of Polydactyly Traits in Chinese and European Chickens.
PLoS ONE, 11(2), e0149010. http://doi.org/10.1371/journal.pone.0149010

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