RnRn vs Rn- how to breed?

HI! I am reusing this forum (aka editing it a turning it into a dif question) This is abt genetics.... i really love horses that have the gene RnRn or whatever it is that makes the roan VERY obvious. I was wondering if there is a certain way i could try to breed this or if its random. I have a mare that passed that i wanted the foals of that had RnRn none of the foals were RnRn, or Rn and i haven't bred one like that yet. I can link her here! Im kind of a roan addictic....
Thanks!

-Nala's Eq

Last edited on 2024-02-27 at 15:16:15 by Nala's EquestrianCenter🐈

Hi! The stallion is not gray; “gg” means he carries no gray genes, while both “Gg” and “GG” means a horse carries gray.

Omg thanks so much! I thought that meant gray!

No problem! Genetics can be very confusing. Usually, when something is capitalized it means the horse has/carries it, and when it is lowercase it means the horse doesn't have/carry it. 

Thanks! I didn't know that!

The only exception to what Robin said about capitalization in genetics is Flaxen. FF means no flaxen. Ff means a flaxen carrier and ff is dominant flaxen/flaxen will be apparent on the horse. Also surprised to see no grey on the sire, but I'm not as familiar with Trakes in game, so guess the blue roans look a little more grey than in other breeds on here. Also nice to see the foal didn't inherit the grey gene from the dam. 

Also "gray" is the American English way of spelling it, while "grey" is more commonly used in other English speaking countries/the Commonwealth. I prefer spelling it "grey" myself even though I'm American. I just think it looks better xD 

Thank you for clarifying that, Sib! I totally forgot about flaxen!

Thanks! I didn't know that!

RnRn means the horse has two copies of the roan gene, breeding a horse with one copy will not necessarily make an RnRn foal. you would need another horse with at least one copy of roan.

++ x Rn+ = 50% chance of Rn+, 50% chance of ++ (no roan)
Rn+ x Rn+ = 25% chance of RnRn, 50% chance of Rn+, 25% chance of ++ (no roan)
RnRn x Rn+ = 50% chance of RnRn, 50% chance of Rn+
RnRn x RnRn = 100% chance of RnRn

these work even if there's other genes like tobiano, sabino and white. roan is a KIT gene, so those other patterns can show up alongside it like RnT or RnSb. breeding an Rn+ x Rn+ pairing is functionally the same as breeding an RnT x RnT in terms of the chance you have at getting roan.

so if you already have a mare with roan your best bet is breeding to stallion with roan, a stallion that already has two copies of roan would increase your chances.

Thanks a lot! Genetics are very confusing.....