I thought it was impossible too but vet says one sneaks out now and then and vet said he was bay as well so IDK. Looks like every bay I ever seen and I got 3 in my field. This is my trail mare and she NEVER looks like this...EVER!! I can't wait till she is back up on weight. My head hurts just trying to wrap my brain around all this!!
Vets know little to nothing of color genetics. A palomino would be ee aa Crcr, and a chestnut would be ee aa, no cream. They can carry agouti(the bay gene), however it doesn't affect the red pigment.. A bay horse would HAVE to be Ee Aa no cream at the very least. Could also be EE Aa, EE AA, or Ee AA.
Edit- Your mare, being chestnut, is one of the following: ee aa, ee Aa, or ee AA. The agouti(A), does not show up.
A palomino would be the same combos, except with Crcr as well. So as you see, there is NO possibility of bay.Posted via Mobile Device
I know that youve got a 50/50 chance for a palomino or a sorrel when the two are bred- the body coat of that foal isnt 'brown' its red. I'm going to say he's not a bay but a dark sorrel.. foals are always darker before they shed.. unless its a miracle, lol.