Summary of performance of SNP by source.

1Sources of SNP are defined in Materials and Methods.2The number of SNP input to the spacing/selection algorithm.3Percent of markers detected as polymorphic in validation studies which tested from 48 to 25,125 SNP.4BovineSNP50 is the name of the developed high-density genotyping assay.5Number of markers that produced genotype calls (>90% call rate) among the 556 tested animals.6Number of SNP for which at least one animal was heterozygous among the 556 tested animals and percent of the total number of markers producing genotype calls.7Average minor allele frequency among the 556 animals in the validation panel.8SNP selected from these sources had previously been shown to be informative in some populations.9NA = not applicable.