Genetic Differentiation of the Two Types of Polish Cold-blooded Horses Included in the National Conservation Program.
Authors: Gurgul Artur, Jasielczuk Igor, Semik-Gurgul Ewelina, Pawlina-Tyszko Klaudia, Szmatoła Tomasz, Polak Grażyna, Bugno-Poniewierska Monika
Journal: Animals : an open access journal from MDPI
Summary
# Genetic Differentiation of Polish Cold-blooded Horse Types Poland's two primary draft horse types—Sztumski and Sokólski—were subjected to genome-wide analysis using Illumina genotyping arrays to quantify their genetic distinctiveness and population structure, prompted by concern over gene pool erosion in cold-blooded horse populations now protected under a national conservation programme. Despite clear phenotypic differences between these breeds, their underlying genetic differentiation had never been rigorously characterised at the molecular level, leaving breeders uncertain about relatedness, admixture patterns, and appropriate selection strategies. The study examined genetic distance between populations, within-population variation, ancestry signatures, and identified genomic regions showing diversifying selection pressures specific to each breed type. The findings provided molecular evidence validating the breeding decisions implemented during conservation programme design and quantified the extent of genetic variation available within each population—critical information for sustainable long-term breeding that avoids inbreeding whilst maintaining breed identity. For equine professionals involved in breeding, veterinary management or performance assessment of these heritage breeds, understanding the documented genetic architecture offers improved context for interpreting individual animal genetics and making informed decisions about breeding stock selection within the constraints of small, managed populations.
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Practical Takeaways
- •Breeders in Polish conservation programs can use these genetic differentiation data to make informed breeding decisions that maintain genetic diversity while managing the two draft horse types
- •The relatively low genetic differentiation despite phenotypic differences suggests careful selection pressure has been applied; continuation of current breeding strategies appears supported by molecular evidence
- •Identification of genome regions under diversifying selection provides targets for maintaining distinct characteristics between Sztumski and Sókólski types during conservation breeding
Key Findings
- •Sztumski and Sókólski cold-blooded horse populations show phenotypic diversity but relatively low overall genetic differentiation using molecular markers
- •Illumina genotyping arrays enabled detailed characterization of genetic distance, within-population variation, admixture patterns, and relatedness levels between the two draft horse subpopulations
- •Study identified genome regions under diversifying selection between Sztumski and Sókólski horses
- •Results provide molecular evidence to support breeding decisions in the Polish national conservation program for cold-blooded horses