The effect of inbreeding on the genetic performance capacity of horses in sports was analyzed on the basis of Holsteiner and Trakehner warm- blood horses in the FRG. For both races only a low degree of inbred horses was found resulting in an average inbreeding coefficient of F = 0.3 - 0.4%. The genetic performance capacity was estimated using BLUP-animal model for the trait "earnings per ranking" in show jumping and dressage. Although correlations between the inbreeding coefficients and the breeding values are very low, they nevertheless show a negative trend in the Trakehner breed and in the dressage performance of the Holsteiner breed. A positive correlation between inbreeding and the jumping ability in the Holsteiner breed may be explained by a strict selection for jumping on the basis of a few sires. Since inbreeding depressions on the genetic performance of riding horses are expected, the effect of inbreeding should be closely observed in future.

J. Wilkens, Rudolf Preisinger, E. Kalm

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 225–228, 1990
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