Genomic estimated breeding value (GEBV) is used for computing additive and dominant SNP effect, the first column should be the sample id, and the rest columns are the additive or dominant GEBVs, an example with three individuals is as following:
id add Ind1 -1.1345 Ind2 0.3245 Ind3 0.0234
The file should be assigned to flag --gebv.
NOTE
If --add is specified, additive breeding value should be provided, so does the flag --dom. If both --add and --dom are specified, the breeding value for additive and dominance should be provided in file, the column of additive breeding value should be at the front of dominant breeding value.