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People call them Sorrels or Chestnuts, I call them red. The genetic phenotype is the same - ee - as in it turns off black.
(Black horses can be EE - homozygous black or Ee - hetrozygous black capable of passing the red genetic small e).
Red can be modified by all other sorts of genes resulting in the varied shading, mane/tail colors, etc.
Color testing can be performed through Animal Genetics, UC Davis, Veterinary Genetic Services and a few others. The price varies depending on the test. A full panel can run $100, individuals $25-40-60 depending on which color/coat pattern being tested. Tests use pulled mane or tail hair and take usually a few days to a week.
Color Coat Calculator at Animal Genetics Lab.
Horse Coat Color Table at UC Davis
