Genome-wide summary of LD. To investigate the extent of LD across the genome, r
2 values were computed between all possible pairs of SNPs within a 2.5 cM window. An average r
2 value was then calculated for each SNP (grey) and ordered along the x-axis as a function of genomic position. SNPs that were significantly associated with branching and located within 2.5 cM of candidate genes are colored in black. The positions of the candidate genes are indicated by a grey arrow on the x-axis. See Additional file 6 for a more detailed view, including gene names.