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Bay Mare, Chestnut Stallion- foal =????

Equine-Reproduction.com Bulletin Board » Equine Genetics » Bay Mare, Chestnut Stallion- foal =???? « Previous Next »


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Sandra (Unregistered Guest)
Unregistered guest
Posted From: 199.89.170.92
Posted on Thursday, June 09, 2005 - 05:10 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Have a light bay mare that was bred to a chestnut stallion (Don schufro).

Mare's dam is chestnut, sire is grey.
Stallion I am not sure on about the dam. Sire (Donnerhall) was a liver chestnut if memory serves me right.

My genetic knowledge is VERY limited but do I have a 50% chance of a chestnut, 25 bay and 25% of something else (black?)???
 

Cathy
Weanling
Username: Cathy

Post Number: 24
Registered: 04-2005
Posted on Thursday, June 09, 2005 - 08:41 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Your percentages are correct if the mare is not homozygous for agouti, and the stallion does not have it. If he carries the agouti gene and she is hetero. it is 75% bay 25% black. If she is homo. for agouti you can not get black.
 

Anonymous
 
Posted From: 203.221.63.68
Posted on Sunday, June 19, 2005 - 08:11 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I definately agree,
Black is not in the agouti at all. Only bay horses or horses bred from bays carry that gene. I think you are most likely to get a bay.
 

BS (Unregistered Guest)
Unregistered guest
Posted From: 62.252.192.13
Posted on Monday, June 27, 2005 - 10:13 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Your mare carries only a single copy of 'E'(she is 'Ee') which causes black hairs to be expressed. The stallion, being chestnut, does not express any black hairs, so is 'ee'. Therefore you have 50% chance of chestnut, and 50% chance of 'other'.

The mare, being bay, could either be heterozygous (1 copy) or homozygous (2 copies) for 'Agouti' - which restricts the black hairs to the points - ie gives you a bay. So she could be 'AA' or 'Aa'. She could NOT be 'aa' which is the absebce of Agouti, and presents itself as black.

The stallion is an unknown quantity - he could be anything (AA, Aa, or aa) as he doesn't express ANY black, we cannot tell what alleles he actually has.

If either parents is homozygous for Agouti (i.e. is 'AA') then you have 50% chestnut, 50% bay. If they are both hetrozygous for Agouti (ie are 'Aa') then you have a 50% chestnut, 37.5% bay, 12.5% black. If the stallion has no agouti and the mare is hetero, you have 50% chestnut, 25% bay, 25% black.



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