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Bay and Bay produced a grullo ???

Equine-Reproduction.com Bulletin Board » Equine Genetics » Bay and Bay produced a grullo ??? « Previous Next »


Author Message
 

Tansy Brassfield
Nursing Foal
Username: Spccutnoak

Post Number: 11
Registered: 08-2005
Posted on Monday, October 03, 2005 - 02:22 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I just got pictures from a client who has a bay tobiano mare who has only thrown bays and sorrel tobianos and was bred to a bay tobiano stud who has also only thrown bay, blacks, brown and chestnuts, he has had eleven tobianos so far. They just had a silver grullo BS. I asked how this is possible she said because they each have grullo in their pedigrees, but I thought one parent had to actually be a dun to make a dun? I would love to hear what you think. Thanks, I can forward pictures if you need to see the filly.
 

Emma
Nursing Foal
Username: Emma

Post Number: 14
Registered: 09-2005
Posted on Monday, October 03, 2005 - 10:51 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I wouldn't think it possible for those two horses to produce a grullo. You are correct in thinking you need at least one parent to be a grullo to produce one. Maybe one of the parents is in fact a grullo and not actually a bay or perhapse the foal is just infact a bay. A blood test would let you know for sure.
 

Tansy Brassfield
Nursing Foal
Username: Spccutnoak

Post Number: 12
Registered: 08-2005
Posted on Monday, October 03, 2005 - 10:55 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

it has a thick dorsal stripe and leg barrings and tipped ears. Plus both parents have never produced any- dun-factored foals before, both are definate bay and white tobianos. You can see them at http://paintedhorseranch.com
 

Emma
Nursing Foal
Username: Emma

Post Number: 15
Registered: 09-2005
Posted on Tuesday, October 04, 2005 - 02:13 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

i just went and had a look at the foal. I'm assuming that the photo's are on the mare & foal page. I wouldnt say that was a silver gullo foal but a black foal. It may be just the photo's but my guess is that what is being called a dorsal stripe will indeed disapear on the first coat change. A true black when born is born a silvery colour and then darkens right up. I have also read on a site that is similar to this one but for horse colour genetics that some foals when born have 'primal' markings which dissapear as the foal gets older. It's kind of like camoflarge for the babies, but is not the dun gene. I can not be 100% certain though as i'm not up to date on the genetics for duns. If the rule is the same for duns as it is for dilutes though then it is not possible for the foal to be a dun.
 

Kim Winter
Nursing Foal
Username: Clafairy

Post Number: 14
Registered: 07-2005
Posted on Tuesday, October 04, 2005 - 08:25 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

We had a foal from a mare we bought not knowing that she was pregnant and her filly was the same colour as the photos of this one look. She turned out to be black...
 

Tansy Brassfield
Nursing Foal
Username: Spccutnoak

Post Number: 13
Registered: 08-2005
Posted on Tuesday, October 04, 2005 - 12:46 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I was thinking it might be a black too but didn't see why she would have the leg barrings. Aren't silver grullo's born usually light dun color? I will let the owner know what you think. Thanks
 

Renee
Yearling
Username: Reneec

Post Number: 52
Registered: 07-2005
Posted on Tuesday, October 04, 2005 - 07:21 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Tansy,
I too had a little black colt born last year that was the same colour as your little filly. He is now jet black. He is actually homozygous, i had him checked as i couldnt work out his colour, and sure enough, he has clipped out to a stunning jet black. I dare say that is what your filly is...



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