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On this colt changing his As to an a wouldn't have any impact on him, because A only interacts with E (it restricts where the E black hairs go). A has no impact on e.

Hey HUSG,

Currently, this colt would never be able to produce a black foal because he has two dominant agouti alleles. By having two dominant agouti alleles, he will always pass on an "A", classic bay phenotype. By changing an "A" to an "a", with the proper cross in mind, 50% chance he will pass on "A" (bay) and 50% chance he will pass on "a" (black). However, since he is "ee", he will always pass on an "e" and will only produce red based foals unless bred to a "EE" or "Ee" mare.

E/e is the expression of black pigment. A homozygous recessive extension, genotype ee, will have a phenotype of red. A homozygous dominant or heterozygous dominant extension, genotype EE or Ee, will have a phenotype of black pigment (black or bay depending on agouti status).
A/a controls the restriction of black pigment. A homozygous recessive agouti, genotype aa, will have even expression of black pigment when dominant extension is present, genotype EE or Ee.

Example one: A horse with the genotype "EeAa" is producing black pigment but the pigment is restricted to the points resulting in a bay phenotype. This horse can produce black, bay, or red foals when crossed with specific pairings.

Example two: A horse with genotype "EE Aa" is producing black pigment but the pigment is restricted to the points and is also a bay phenotype. Different from the previous example, this horse can produce black or bay foals and never red foals.

I hope this helps. :)

Glad I could help!

And yes, by adding DP he could produce liver foals so long as he also passes on his Sooty gene. (Or the mares pass on their Sooty and DP gene.)

And yes again, by changing "AA" to "Aa" he has a 50% chance of donating his "a" and a 50% chance of donating his champagne gene to produce classic champagne foals (so long as the mares at at least EeAa, best chance would be to breed mares with EEaa).

Yes, his current genetic would allow him to display DP. I am not good at detecting DP on a het sooty champagne though, so I can't determine if he is currently expressing it or not. The good news is this, if he is currently expressing DP, you won't get charged for adding DP. :)

Also, yes, phenotypically speaking he will not change. Phenotype is the observable characteristics resulting from the interaction of an individuals genotype. Genotype being the genetic constitution of an individual.

Phenotype = what you can see
Genotype = the hidden code

You have some appies with great spots! You should be proud of these handsome studs.

Also, I would definitely keep the original colt intact if he is out of a favorite aged stallion. He would always make nice foals without any GMTing. :)

No problem, it was my pleasure. I enjoy going "What if" too. :)