What color foal do you get when breed a chestnut mare to red roan?

You can't definitively say what color foal you'll get from a chestnut mare bred to a red roan stallion. Here's why:

* Roan is a coat pattern, not a base color. A red roan horse has a base color of chestnut, but with white hairs mixed in.

* The red roan stallion carries both chestnut and white genes. This means he can pass either one on to his offspring.

Possible foal colors:

* Chestnut: The foal could inherit the chestnut gene from both the mare and the stallion.

* Red Roan: The foal could inherit the chestnut gene from the mare and the roan gene from the stallion.

* Bay: If the stallion carries a bay gene, the foal could inherit the bay gene from the stallion and the chestnut gene from the mare.

It's important to remember that horse genetics are complex. Other factors, like the stallion's specific coat gene combinations and the mare's lineage, can influence the foal's color.

To get a more specific prediction, you'd need to know the sire's full genotype (genetic makeup). This information is usually available from the horse's registration papers.