Pedigree Query

when you breed a chestnut to a grey? The grey stallion has a bay sire.

It depends.

If the grey stallion is homozygous, then you get a grey no matter what you breed him to. If he is heterozygous, then you have a 50/50 chance that the resulting foal will turn grey.

Then it also depends what the base color of the grey stallion--ie, what color he was before he turned grey. If he was chestnut, you will get a chestnut foal with a 50% chance of turning grey. If he was bay and carried for chestnut, you have a 50% chance of bay and 50% chance of chestnut (which still may turn grey--see above.) If the base color was bay and he doesn't carry for chestnut, then you will get a bay that--again--may or may not turn grey.

I just noticed the part about the grey stallion having a bay sire. So he isn't homozygous, which rules out the possibility of him only being able to produce grey. Everything else remains the same.

Thanks, that really helps. It sounds like we might get anything.

What about this mating?

http://www.pedigreequery.com/captain+countdown

Grey with Grey sire and chestnut mother

http://www.pedigreequery.com/marfalous+friend

Chestnut with Grey sire and bay mother

I would assume the odds of having a grey are high (how high)? What are some color possibilities? I'm afraid I know little of color genetics.

Derring, with that breeding it again depends on what the base color of the stallion was before it turned grey. If he was chestnut, then the resulting foal will be chestnut with a 50/50 chance of turning grey.

If the sire was bay before he greyed, then there's a 50% chance the foal will be chestnut and 50% chance it will be born bay. On top of that you'll still have a 50% chance that it will turn grey later.

So no matter what color its born as, it has a 50% chance of turning grey.

I'm afraid I have no idea what color the sire was before he turned grey,

Thanks for the info.

http://www.equinecolor.com/grey.html

nice website for color explanations.

Derring wrote:What about this mating?

http://www.pedigreequery.com/captain+countdown

Grey with Grey sire and chestnut mother

Relaunch, like Captain Countdown, was a bay that greyed was capable of siring chestnuts so it's likely that Captain Countdown will as well. Since CC had a chessie mother, he's 50% likely to get a grey and just as likely to get a chessie from a chessie dam as a bay.

Derring wrote:http://www.pedigreequery.com/marfalous+friend

Chestnut with Grey sire and bay mother

He's not grey so he won't sire grey unless bred to a grey mare.

Actually, the above is a mare that is in foal to Captain Countdown. So perhaps it will be a chestnut that turns grey.