Anyway...I'm reading the powerpoint and according to it: "All roan horses are heterozygous Rnrn as homozygous RnRn is lethal".
Is this true? I've actually never heard of this. Does it work the same way as lethal white? If I thought about it correctly this would mean breeding two roans would have a 25% chance of lethal. Am I totally crazy or is this incorrect?