| Summary: | The current research was undertaken to use the genetic potential of animals to obtain high-quality dairy products. Single nucleotide polymorphisms (SNPs) in <i>SLC27A3</i> gene were identified in Zošľachtená valaška sheep using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Correlations between genotypes and milk composition and nutritional value were analysed This study showed that milk from sheep with <i>TT</i> genotype in the SNP4 locus was characterised by higher (<i>p</i> < 0.01) fat and dry matter content and lower lactose concentration, compared to sheep with <i>AA</i> and <i>TA</i> genotypes, respectively. Moreover, it was found that animals with <i>GG</i> genotype in SNP1 produced milk with higher C18:1n9c, C18:1n7t, CLA, and other unsaturated fatty acids (UFAs) content than sheep with <i>TT</i>. Additionally, milk from animals with <i>CC</i> at the SNP3 locus had significantly higher (<i>p</i> < 0.01) levels of UFAs than milk from sheep with other genotypes in the SNP3. In summary, it may be concluded that milk from animals with <i>TT</i> genotype of SNP4 is characterised by higher fat and dry matter content. Whereas, milk from sheep with <i>GG</i> in SNP1 and with <i>CC</i> in SNP3 is characterised by higher content of UFAs, which increases milk value as material for functional food production.
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