Pangaré or mealy

What it looks like

Pangaré gives a pale muzzle and lighter areas on the belly, inner limbs and sometimes around the eyes. It can be particularly easy to recognize on bay and chestnut coats. The pale hair blends gradually into the surrounding color, unlike the sharply defined white borders of many spotting patterns. Record where the pale areas occur and how strongly they contrast with the base color.

Sources for this explanation [2]

What happens biologically

A study comparing horse populations identified a region near the EDN3 gene that might help control gene activity and proposed a possible link with mealy coloring. A regulatory region can influence when or how strongly a gene works, but proximity to a gene does not establish causation. This finding is a candidate explanation, not proof of one pangaré mutation.

Other equids provide useful comparisons rather than direct answers for the horse. For example, an ASIP variant associated with loss of light points was identified in donkeys. Donkeys are a different species; their result cannot simply be turned into a horse pangaré test.

Sources for this explanation [2] · [3]

Inheritance and DNA testing

Traditional symbols such as P and p are hypotheses for an effect and its absence, not identified horse variants with a universally validated test. Writing P/p therefore does not establish that the horse carries one proven pangaré copy and one proven non-pangaré copy. Precise mating probabilities should not be calculated as though that model were confirmed.

For example, an Agouti test may help identify a bay base beneath pale underparts, while a known dilution test investigates a different explanation for light hair. Neither result automatically identifies the cause of pangaré. Record the appearance alongside the tests rather than making the unknown mechanism seem solved.

Sources for this explanation [1] · [2]

Confusions, limits and health

Pale underparts differ from progressive graying, widespread dilution and unpigmented white markings. Terms also vary between countries: the French identification term noir pangaré does not prove a particular pangaré mutation. For a very dark bay with a paler muzzle and underparts, keep the visible description separate from any established genotype. A pale muzzle does not tell you anything about athletic ability.

Sources for this explanation [3] · [4]

Where the explanations come from

Laboratory resources explain which variants are tested and how to read their results. Research papers describe the evidence, discoveries and remaining uncertainties. Each article links its explanations to the relevant sources. Published titles stay in their original language so you can find the exact work.

1. 1 · Laboratory explanation

   UC Davis VGL — Equine Coat Color Genetics

2. 2 · Research paper

   Fegraeus et al. (2018) — A potential regulatory region near EDN3 may control both harness racing performance and coat color variation in horses

3. 3 · Research paper

   Abitbol et al. (2015) — An ASIP missense mutation associated with the no light points phenotype in donkeys

4. 4 · Research paper

   Corbin et al. (2020) — An independent locus upstream of ASIP controls variation in the shade of the bay coat colour in horses