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Re: [RC] Our next generation distance horse.... - aggiekrisThe "E" locus is for "Extension", and the "A" locus is for "Agouti". Extension controls whether the horse has eumelanin (black) pigment or pheomelanin (red) pigment. Black based means black OR bay, and red based is chestnut. Agouti controls the *distribution* (over the whole body or just at the points) of black pigment, IF present. Therefore, only black pigmented horse *express* agouti, but all horses have genes at that locus. Make sense? At Extension, black is dominant to red. So your guy has one of each (dominant is E and recessive is e), but since this is a completely dominant gene, he will express only black. Now for agouti. Since this is a black pigmented horse, he will express it. You can think of agouti as working opposite the way extension does - less black is more dominant. Therefore the two variants of bay (won't detail this further to spare confusion) are both dominant to solid black. Your guy has both recessives(aa), so he's a black. This means that if he remains a stallion, and you breed him to black mares, you *should* never get a bay foal (but there's an exception in arabs to this rule) out of a black mare, and bred to any color, you have possibility of producing red based OR black based colors, since he is heterozygous at Extension. Sorry if this may be hard to understand, as it's late and i'm tired. Let me know if anything needs clarification. Kris I have a question for vets and others who are into genetics. I guess it is only endurance related in that this guy would be a better horse for the sport as a gelding I think...we had him tested and he came out Ee, aa. So whtat the heck does that mean?? S Sandy Adams Deep Sands Arabians www.deepsands.com ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ridecamp is a service of Endurance Net, http://www.endurance.net. Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp Ride Long and Ride Safe!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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