What does N/N mean? - Page 2

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What does N/N mean?

This is a discussion on What does N/N mean? within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category
  • What does N/N mean genetics
  • What does it mean nn copies

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    06-27-2012, 12:45 PM
All N in N/N or H/N or what ever is that there is no mutation present. You can get it for anything from HyPP to anthing a horse may have. Anything that can be tested for through DNA if the mutation is not present it is represented by an N.
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    06-27-2012, 02:22 PM
Arabian horses tested for CA (cerebellar abiotrophy) come back N/N, N/CA or CA/CA. N/N is what you reallllllly want.
    06-27-2012, 04:01 PM
N/N just means the horse is completely negative for a gene. N/another letter means it carries one gene (heterozygous) and Letter/Letter means the horse carries two copies of a gene (homozygous).

Also important when breeding breeds that carry Frame Overo, as breeding two N/O horses leaves a 25% of O/O, which is fatal.
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    06-27-2012, 05:46 PM
So basically N/N means that whichever disease there is is not present in that horse's genes?
    06-27-2012, 08:23 PM
Not diseases only, just a gene. The diseases that have been mentioned are all genetic diseases.
    06-27-2012, 09:46 PM
[QUOTE=Poseidon;1569766]Not diseases only, just a gene. The diseases that have been mentioned are all genetic diseases.[/QUOTEyes the same goes for australian shepherds 2 merles should not be bred because of the possibility of a lethal white...principle can cross all genetics...in horses or any other species one individual can be free of a gene altogether, be a carrier that can pass on to their offspring but not exhibit the trait themselves or have the trait themselves and pass it on to offspring]
    06-28-2012, 03:07 AM
Originally Posted by Poseidon    
Not diseases only, just a gene. The diseases that have been mentioned are all genetic diseases.
Okay thanks. :)

n/n, pedigree

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