| Within this research project we aim to investigate the segregation of breed relevant coat color assoziated genes/alleles within the Austrian horse breeds Lipizzan and Noriker and "Weißer Barockesel". The identification of coat color alleles and carrier animals is relevant for planning and performing adequate breeding programs. Certain coat color phenotypes like the roan color (Mohrenkopf) within the Noriker breed and the diluted colors (Hermeline, Perline) within the White Donkey breed, are in the focus of the breeding programs. The identification of segregating color loci therefore is essential for conservation breeding, as the specific coat colors origin from a limited gene pool. Breeding for color is a major goal for the Federal Lipizzan stud farm of Piber. Here the underlying base colors, dilutions and patterns of white often are phenotypically not visible as they get overlaid by the dominant gray color. Whereas the breeding objective of Piber is defined by the gray to white horse (predominantely caused by homozygosity on the gray locus), underlying patterns of white are not favoured, because they are linked with a higher photosensibility. In addition the author found indications for the segregation of dilution genes and spotting genes within the breeding herd of Piber. Such alleles segregate at a low frequency and get interpreted as remaining from the baroque breeding period. Therefore a precise scientific analysis of the color gene pool of the actual Lipizzan population including individual coat color gene charts will contribute to optimize selection decisions and conservation breeding. In this study we will use genotypic data already worked out by the author in previous works and it is planned to screen additional coat color loci of the Lipizzaner (276 horses) and "Weißer Barock Esel" (sample of 35 key animals) in order to create a complete genotypic profile on individual level. By use of segregation studies and the identification of carrier animals it will be possible to contribute to practical breeding work and planning. In a second step the white markings of the Lipizzan population will get phenotyped and analysed by BLUP models and GWAS analyses. A third aim of this project is a verification study of an already identified genetic marker (previous work from the author) for the roan coat color in Noriker horses. Such a verified marker could enhance and simplify selection decisions within this specific coat color strain of Noriker horses. |