Pipeline in R used to calculate linkage disequilibrium (LD) and data vizualization of LD. That was one of steps used for results of the LD's research in Santa Inês ovine population : https://www.nature.com/articles/s41598-018-27259-7
*** Description of files ***
1. SNP ID
2. Chromosome
3. SNP position
4. Genotype of animal 1, nitrogene basis. Example: GG, CC, AC, etc.
5. Genotype of animal 2, nitrogene basis. Example: GG, CC, AC, etc.
...
column i. Genotype of animal i, nitrogene basis. Example: GG, CC, AC, etc.
Assuming i is the number of animals. Missing values assumed as "--".
1. Animal ID
2. Sex, as 1 and 0
3. Trait
1. SNP ID
2. Chromosome
3. SNP position