In the thesis, we describe the general aspects and applications of genomic selection, with an emphasis on the American Quarter Horse breed in Slovenia. Genomic selection is a tool for more efficient selection. It is a relatively new method that, in addition to pedigree and phenotypic data, is based on the use of genomic information. It allows you to evaluate important properties, including those that are difficult to measure. The population of the American Quarter Horse is increasing every year, with more than 6 million registered horses since 1940. Due to the versatility of the breed, calm character, their industriousness, which is manifested in the outstanding achievements of western disciplines, the breed is becoming more and more popular. At the same time, the breed is considered to have relatively often expressed genetic defects. By knowing the mechanisms of inheritance and genotyping of horses, we have the opportunity to reduce the frequencies of frequencies of unwanted alleles. Genotyping makes it possible to predict the breeding value of horses for quantitative traits, the degree of expression for monogenic traits, and to account for the genetic diversity of populations while preventing inbreeding. In this task, we focused on the expression of monogenic traits that cause genetic defects, as well as on ways to improve the breed population in Slovenia.
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