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Publication type: Diploma Thesis

Year: 2016

Author(s): Neugebauer, Corinna

Title: Analyse der Verwandtschaftsstrukturen in der österreichischen Haflingerpopulation.

Other title: Analysis of coancestry within the Austrian Haflinger horse populations

Source: Diplomarbeit, Vet. Med. Univ. Wien, pp. 66.


Advisor(s):

Brem Gottfried

Reviewer(s):
Van Den Hoven Rene

Vetmed Research Units:
Institute of Animal Breeding and Genetics


Abstract:
In this thesis the coancestry and genetic relationship of seven Haflinger populations within Austria have been analysed. The data, including 57.021 horses, from the studbook of the ARGE Haflinger (Arbeitsgemeinschaft österreichischer Haflingerzüchter) and Tyrolian Haflinger breeding organization served as basic raw material for the analysis of the average coancestry coefficient (fij), the average genetic distance and the Nei’s genetic distance. The calculations of the mentioned genetic parameters were done by using the computer program ENDOG v4.6. For this analysis three reference populations with a total of 5.571 animals were created. Reference population 1 (R1) included 741 breeding animals from 2008 to 2015, reference population 2 (R2) included 2.270 breeding animals from 1993 to 2000 and reference population 3 (R3) included 2.560 breeding animals from 1978 to 1985. The relationship parameters calculated in this study showed that the coancestry of the breeding animals in the Tyrolian Haflinger breeding organization is higher than of the breeding animals from the ARGE Haflinger. Compared to the mare population the genetical uniformity between the stallion population was found to be tendentiously higher in R2 and R3. However in the current reference population (R1) the mares are closer related to one another than the stallions are. The highest coancestry in R2 and R3 was found inside the subpopulation of Tyrol. The closest coancestry in the current reference population (R1) was found in Upper Austria. Haflinger populations from Upper Austria and Tyrol were related closest in R1 and R2. In R3 the nearest relationships were existing between Tyrolian and Lower Austrian animals. The lowest average coancestry coefficient was calculated for Carinthian horses (in R1 and R3) and Styrian horses (in R2). The lowest coancestry in R2 and R3 was found between Styrian and Carinthian Haflingers. In R1 the lowest coancestry was found between horses from Carinthia and horses from Lower Austria. The breeding population of Austrian Haflinger horse decreased from R3 (2.560 animals) to the current reference population R1 (741 animals) to 1.819 animals (71%). The coancestry however increased from R3 to R1. Thus alterations in the population size behaves indirectly proportional towards coancestry, which means that the more the population decreases the closer related the animals will be.


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