Not in any  particualar breed-Its the just absense of pangare markings(mealey nose with/without eye rings) Usually in genetic terms called No Light Points NLP

"The Pangare' locus controls whether or not donkeys have dark or light points.The dominent wild-type form of this gene (Pa+) creates light points,and a donkey that is homozygous recessive (Pamp) at this locus will have dark points."

It interesting that we seem to  recognise those light points =donkey.

I have seen some NLP that one had to  look twice at to check it was a donkey not a mule.