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Biochemical polymorphism in relation to performance in horses.

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  • 1Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Box 7023, S-750 07, Uppsala, Sweden.

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|November 19, 2013
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Summary
This summary is machine-generated.

Genetic markers, specifically serum esterase (Es) locus variation, significantly correlate with racing performance in Swedish Trotter horses. This finding supports additive genetic models and aids in practical animal breeding strategies.

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Area of Science:

  • Animal Genetics
  • Quantitative Genetics
  • Biochemical Polymorphism

Background:

  • Understanding the link between genetic variation and performance traits is crucial for both theoretical genetics and practical animal breeding.
  • Biochemical polymorphism studies can reveal genetic markers associated with desirable traits.

Purpose of the Study:

  • To investigate the relationship between biochemical polymorphism and racing performance in Swedish Trotter horses.
  • To identify specific genetic loci associated with performance traits.

Main Methods:

  • Analysis of racing performance records from over 25,000 Swedish Trotter horses (1970-1979).
  • Genotyping for six blood group and nine electrophoretic loci.
  • Statistical analysis using linear models to assess associations between marker genes and performance traits (racing index and proportion of started horses).

Main Results:

  • A highly significant association was found between variation at the serum esterase (Es) locus and the proportion of horses that started racing.
  • The effects of different esterase alleles followed an additive genetic model.
  • Four weakly significant associations were also identified, but linkage and heterozygosity tests revealed no significant relationships.

Conclusions:

  • The serum esterase locus is a significant genetic marker for racing performance in Swedish Trotters.
  • Findings support the use of marker-assisted selection in animal breeding for performance traits.