Figure 1

Polled phenotype of Friesian origin. A) Relative position of the candidate mutations for the polled phenotype of Celtic (P_C) and Friesian (P_F) origin. All reference sequence (RefSeq) alleles are shown in blue and POLLED candidate mutations in orange. The insertion-deletion events (P_5ID, P_202ID and P_80kbID) are presented as bars and SNPs as lines. Note that this figure does not include the fairly distant SNP rs134968598 at position 1 390 292 bp. B) Pedigree of 13 Holstein-Friesian animals used to narrow down the interval containing the POLLED mutation of Friesian origin. Color code is as above. The recombinant haplotypes of the ROSSI and ELBOY RED bulls are shown with the corresponding colors. Polled homozygous (PP) individuals are represented by solid circles (females) and squares (males); declared polled heterozygous animals (Pp) by half-filled symbols; horned animals (pp) by empty symbols; missing and ungenotyped individuals are marked with a diagonal line.