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Selected Publication:

Publication type: Diploma Thesis

Year: 2016

Author(s): Sauer, Katharina

Title: Inzuchtanalyse der österreichischen Haflingerpopulation.

Other title: Inbreeding analysis in the Austrian Haflinger population

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 102.


Advisor(s):

Brem Gottfried

Reviewer(s):
Van Den Hoven Rene

Vetmed Research Units:
Institute of Animal Breeding and Genetics


Abstract:
For the analysis of inbreeding in the Austrian Haflinger population data sets were provided from the ARGE Haflinger and the Haflinger Pferdezuchtverband Tirol comprising the information of 57.021 animals. For the calculation of inbreeding coefficients according to Wright (1922) the Haflinger population was seperated into three reference groups. Haflinger horses, which were used for breeding between 2008 and 2015, belonged to reference group 1. Reference group 2 was represented by animals used for breeding between 1993 and 2000 and reference group 3 were Haflinger horses used for breeding between 1978 and 1985. The mean inbreeding (calculated for all generations) in reference group 1 was 11,9%. It comprised 8,8% in reference group 2 and 6,3% in reference group 3. 66% of Haflinger horses in the current reference group (R1) showed inbreeding coefficients between 10 and 15%. In the other two reference populations (R2 and R3) 58% respectively 54% of the Haflinger horses showed inbreeding coefficients between 5 and 10%. Between mares and stallions no differences in mean inbreeding coefficients were observed. Mares had higher maximum values and lower minimum values than stallions. The highest maxima for mares were 31,5% and 25,8% for stallions respectively. The stallion lines with the largest inbreeding coefficients were the N line (reference population 1) and the W line (reference population 2 and 3). The lines with the lowest level of inbreeding were the M line (reference population 1) and the S line (reference population 2 and 3). Tyrol showed the highest inbreeding coefficients, followed by Upper Austria and Salzburg. The lowest results were found in Styria, Burgenland and Carinthia. The greatest increase of inbreeding over the last 30 years appeared in Salzburg, while Lower Austria and Styria showed the smallest increase. In generally, horses from the Haflinger Pferdezuchtverband Tirol showed higher inbreeding coefficients than horses from the ARGE Haflinger. The increase of inbreeding over the last 30 years correlates negatively with the decrease in Haflinger breeding population. There was a decrease in the number of breeding animals from 2.560 (R3) to 741 Haflinger horses (R1). Compared to other horse breeds, e.g. the Austrian Noriker and the Lipizzaner, the Austrian Haflinger population showes high levels of inbreeding. Although there has been an intensified exchange of breeding animals during the last decade the development of inbreeding and inbreeding increase could not be reduced. Without using selective measures an accelerated increase of inbreeding will occur within the next years.


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