Tested Pony: Ace's Tidewater Promise

This handsome colt is Ace's Tidewater Promise, a son of popular island stallion Ace's Black Tie Affair. He's a full brother to Tidewater's Reflection of Ace who is living on Assateague. Tide lives at Kerkaken Acres in Virginia, near Chincoteague.

It's obvious from looking at him he's a buckskin so he tested as CR/n. Which means he has one copy of the cream dilution. His dam Tidewater Treasure is a buckskin so he inherited it from her. She passed her copy of cream on to her foals a little over half of the time.

Because of the color of his parents Tide had two possibilities to be homozygous for something, tobiano and black. Because both of his parents are tobiano there was a possibility both could pass it on to him. Tide tested as TO/n which means he only has one copy of tobiano or heterozygous.

Tide's sire is black and his dam is buckskin so they both could have passed a copy of black or E on to him. Ace's dam is chestnut and Tidewater Treasure's sire is chestnut so that tells us they both carry recessive chestnut. Tide tested as E/E so he's homozygous for black. He does not carry recessive chestnut so he can't sire chestnut foals, even if the mare is chestnut. He can only sire black and bay foals.

Since Tide is a buckskin with a black sire he should test as having one copy of agouti. And indeed he did with the test showing A/a. Agouti restricts black to the points which creates bays and buckskins. Tide's full sister Tidewater's Reflection of Ace is solid black so she didn't inherit their dam's copy of agouti.