Roan

Roan is a white patterning coat colour trait of intermixed white and coloured hairs in the body while the head, lower legs, mane and tail remain colored. Los caballos Ruano nacen con el patrón, aunque puede que no sea obvio hasta que se desprenda el pelaje. Los pelos blancos y de colores se mezclan de manera uniforme en caballos que heredan el gen Ruano clásico, que puede diferenciarlo de varios patrones mímicos llamados roaning. Los patrones ruanos tienden a ser desiguales en la distribución de los pelos blancos y no se ha definido la herencia de la ondulación. La mutación que causa el color de capa Ruano aún no ha sido identificada. La prueba de capa Ruano (P659) analiza los marcadores de ADN que se asocian con el color de la capa Ruano en varias razas. Los marcadores de ADN se pueden utilizar para determinar si un caballo tiene la mutación Ruano y cuántas copias. Esta prueba detecta tres variantes (alelos), Rn, Rn * y N. Es dominante el alelo Rn. Una o dos copias del alelo Rn resultan en un color de capa Ruano. El alelo Rn * es muy infrecuente y no siempre asociado con el color de la capa Ruano, este alelo sólo se ha observado en caballos andadores de Tennessee y caballos de las montañas rocosas. El alelo N es recesivo y no tiene efecto en el color básico.

The Coat Colour Roan test encloses the following results, in this scheme the results of the Coat Colour Roan test are shown in combination with the possible results for the tests that determine the basic Coat Colour (Coat Colour Chestnut and Coat Colour Agouti test):

Result Roan	Result Chestnut + Agouti	Coat Colour	Descripción
N/N	e/e + A/A, A/a or a/a	Chestnut, Sorrel	Not Roan. The basic colour chestnut/sorrel is not modified unless modified by other colour modifying genes. It can only pass on allele N to its offspring.
N/N	E/E or E/e + A/A or A/a	Bay, Brown	Not Roan. The basic colour bay/brown is not modified unless modified by other colour modifying genes. It can only pass on allele N to its offspring.
N/N	E/E or E/e + a/a	Black	Not Roan. The basic colour black is not modified unless modified by other colour modifying genes. It can only pass on allele N to its offspring.
Rn/N	e/e + A/A, A/a or a/a	Chestnut/sorrel Roan	One copy of the dominant Rn allele. The colour is chestnut/sorrel roan, unless modified by other colour modifying genes. It can pass on either allele N or Rn to its offspring.
Rn/N	E/E or E/e + A/A or A/a	Brown/bay Roan	One copy of the dominant Rn allele. The colour is brown/bay roan, unless modified by other colour modifying genes. It can pass on either allele N or Rn to its offspring.
Rn/N	E/E or E/e + a/a	Black Roan	One copy of the dominant Rn allele. The colour is black roan, unless modified by other colour modifying genes. It can pass on either allele N or Rn to its offspring.
Rn*/N	e/e + A/A, A/a or a/a	Chestnut/sorrel or Chestnut/sorrel Roan	One copy of the uncommon Rn* allele. The colour can be chestnut/sorrel or chestnut/sorrel roan, unless modified by other colour modifying genes. It can pass on either allele N or Rn* to its offspring.
Rn*/N	E/E or E/e + A/A or A/a	Brown/bay or Brown/bay Roan	One copy of the uncommon Rn* allele. The colour can be brown/bay or brown/bay roan, unless modified by other colour modifying genes. It can pass on either allele N or Rn* to its offspring.
Rn*/N	E/E or E/e + a/a	Black or Black Roan	One copy of the uncommon Rn* allele. The colour can be black or black roan, unless modified by other colour modifying genes. It can pass on either allele N or Rn* to its offspring.
Rn/Rn	e/e + A/A, A/a or a/a	Chestnut/sorrel Roan	Two copies of the dominant Rn allele. The colour is chestnut/sorrel roan, unless modified by other colour modifying genes. It can only pass on allele Rn to its offspring.
Rn/Rn	E/E or E/e + A/A or A/a	Brown/bay Roan	Two copies of the dominant Rn allele. The colour is brown/bay roan, unless modified by other colour modifying genes. It can only pass on allele Rn to its offspring.
Rn/Rn	E/E or E/e + a/a	Black Roan	Two copies of the dominant Rn allele. The colour is black roan, unless modified by other colour modifying genes. It can only pass on allele Rn to its offspring.
Rn/Rn*	e/e + A/A, A/a or a/a	Chestnut/sorrel Roan	One copy of the dominant Rn allele and one copy of the uncommon Rn* allele. The colour is chestnut/sorrel roan, unless modified by other colour modifying genes. It can pass on either allele Rn or Rn* to its offspring.
Rn/Rn*	E/E or E/e + A/A or A/a	Brown/bay Roan	One copy of the dominant Rn allele and one copy of the uncommon Rn* allele. The colour is brown/bay roan, unless modified by other colour modifying genes. It can pass on either allele Rn or Rn* to its offspring.
Rn/Rn*	E/E or E/e + a/a	Black Roan	One copy of the dominant Rn allele and one copy of the uncommon Rn* allele. The colour is black roan, unless modified by other colour modifying genes. It can pass on either allele Rn or Rn* to its offspring.
Rn/Rn	e/e + A/A, A/a or a/a	Chestnut/sorrel or Chestnut/sorrel Roan	Two copies of the uncommon Rn* allele. The colour can be chestnut/sorrel or chestnut/sorrel roan, unless modified by other colour modifying genes. It can only pass on allele Rn* to its offspring.
Rn/Rn	E/E or E/e + A/A or A/a	Brown/bay or Brown/bay Roan	Two copies of the uncommon Rn* allele. The colour can be brown/bay or brown/bay roan, unless modified by other colour modifying genes. It can only pass on allele Rn* to its offspring.
Rn/Rn	E/E or E/e + a/a	Black or Black Roan	Two copies of the uncommon Rn* allele. The colour can be black or black roan, unless modified by other colour modifying genes. It can only pass on allele Rn* to its offspring.