Pedigree structure and genetic variation in the two endangered Norwegian horse breeds: Dole and Nordland/Lyngen

作者：Olsen H F^*; Klemetsdal G; Ruane J; Helfjord T

来源：Acta Agriculturae Scandinavica Section A-Animal Science, 2010, 60(1): 13-22.

DOI：10.1080/09064701003639884

• Breed conservation
• effective population size
• pedigree analysis
• probability of gene origin

To examine the genetic variation in two endangered Norwegian horse breeds, the pedigree structures were investigated, and key parameters such as inbreeding coefficients, effective population size, effective number of founders, effective number of ancestors and effective number of founder genomes were calculated. The data consisted of 31,142 individuals of the Dole horse and 1973 individuals of the Nordland/Lyngen horse, for which the complete generation equivalent was 10.5 and 7.2, respectively. In both breeds, the pedigree data were more than 98.5% complete in the fourth generation, allowing the rate of inbreeding and the effective population size to be precisely estimated, actually measuring the fractional loss of heterozygosity, comparable across generations (not so for the other measures). The level of inbreeding was about 12% in both breeds, with a rather wavy pattern during the past 50 years in the Dole. Considering the last generations only, the effective population size was found to be 152 in the Dole and 42 in the Nordland/Lyngen. For both populations selection in the future should be based on optimal contribution.

• 出版日期2010