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Homozygous tobiano

Equine-Reproduction.com Bulletin Board » Equine Genetics » Homozygous tobiano « Previous Next »


Author Message
 

Saffron
Breeding Stock
Username: Saffron

Post Number: 267
Registered: 01-2007
Posted on Friday, August 10, 2007 - 05:17 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi all
Can you get produce a homozygous foal if one parent is a solid?
I am sure you cant so its not worth me testing my horses??
And can 2 non homozygous tobianos produce a homozygous?
Thanks..still not following these genetics!
 

Joyce
Yearling
Username: Luv2ridesaddleseat

Post Number: 52
Registered: 12-2006
Posted on Friday, August 10, 2007 - 07:04 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

At least one parent HAS to be homozygous for tobiano in order to produce a homozygous baby.
 

Emily West
Breeding Stock
Username: Paintlover

Post Number: 282
Registered: 06-2006
Posted on Friday, August 10, 2007 - 08:48 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Both parents have to be tobiano to produce a homozygous baby. If both parents are homozygous then the baby will be homozygous. If one Parent is Homozygous and the other heterzygous tobiano there would be a 50% chance for a homo baby. If both parents are heterzygous for tobiano there is a 25% chance for a homozygous baby. So yes, two non homozygous parents can produce a homozygous baby but the chances are smaller.
 

Joyce
Yearling
Username: Luv2ridesaddleseat

Post Number: 53
Registered: 12-2006
Posted on Friday, August 10, 2007 - 11:16 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

hmmm, I know I've read that at least one parent has to be homozygous in order to produce a homozygous baby. I'll have to find where I read that.
 

Dorthy Brown
Breeding Stock
Username: Dodib

Post Number: 146
Registered: 04-2006
Posted on Friday, August 10, 2007 - 01:16 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Did I read somewhere that medicine hat paints are almost always homozygous???
 

Jenni Luttrell
Breeding Stock
Username: Bugrace2000

Post Number: 332
Registered: 02-2007
Posted on Friday, August 10, 2007 - 03:45 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I'm not sure on that but its a possibilty I no they are valuable for some reason
 

Teresa Byersdorf
Weanling
Username: Bravehart

Post Number: 27
Registered: 04-2007
Posted on Friday, August 10, 2007 - 04:43 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Medicine hat paints are not more likely to be homozygous. Medicine hats are typically toveros..they carry the tobiano and overo gene. A few years back, I bred my Medicine hat Tovero mare to a solid stallion and got a solid foal..so all bets are off unless the medicine hat is also homozygous tobiano..which it may or may not be.
 

Emily West
Breeding Stock
Username: Paintlover

Post Number: 283
Registered: 06-2006
Posted on Friday, August 10, 2007 - 06:11 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Joyce,
I would be curious to know where you read that. I am pretty sure though that that wouldn't be the case. But I am always open to learning. Here is link to some tobiano genetic tables.

http://www.palouse.net/Paint/tobiano.htm
 

Joyce
Yearling
Username: Luv2ridesaddleseat

Post Number: 54
Registered: 12-2006
Posted on Friday, August 10, 2007 - 10:05 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hmmm. I'm looking in my book marked stuff. It may NOT be right. I'm thinking you are right! I'll see if I can find it.
 

Emma
Breeding Stock
Username: Emma

Post Number: 180
Registered: 09-2005
Posted on Monday, August 13, 2007 - 10:01 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok, what happens is when you have a TOVERO/TOBERO you have a horse which carries both the OVERO and TOBIANO gene's when breeding to a TOVERO/TOBERO generally this will give you about a 75% chance of having a coloured foal because the horse carries both the coloured gene's. A horse with a single coloured coat gene gives you a 50% chance at a coloured foal. So this is why MOST med hat paints produce more colour than say your normal tobiano.
You could get a homozygous foal from a 'solid' parent if that parent was actually a minimal tobiano ... say with a couple of socks, but you couldn't from a TRUE solid.
Hope that has been of some help.
The APHA site has a lot of info on coat colours. There is also a fair bit on the web ... just google 'Horse Colour'
 

Joyce
Yearling
Username: Luv2ridesaddleseat

Post Number: 55
Registered: 12-2006
Posted on Monday, August 13, 2007 - 07:10 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I don't know where I read what I read. Maybe it was just a message board and that person didn't know what they were taking about. :-)

Thanks Emma, this stuff drives me nuts!



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