Analysis of inbreeding in the Swedish Gotland pony using pedigree information and microsatellite markers
In this study inbreeding in the Swedish indigenous breed Gotland pony has been investigated using traditional genealogical methods and microsatellite markers. Since the breed is classified as endangered-maintained, it is valuable to know the inbreeding status and population structure. Pedigree data...
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| Formato: | H2 |
| Lenguaje: | Inglés sueco |
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SLU/Dept. of Animal Breeding and Genetics (until 231231)
2010
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| Sumario: | In this study inbreeding in the Swedish indigenous breed Gotland pony has been investigated using traditional genealogical methods and microsatellite markers. Since the breed is classified as endangered-maintained, it is valuable to know the inbreeding status and population structure. Pedigree data was very complete with PEC-values for some horses above 0.8 already during the first decades of the 1900’s. The average inbreeding coefficient was 0.11 for horses born 1996 to 2005. The average increase in inbreeding was 0.75 % per generation since 1985. The average generation interval was 10.4 years. The inbreeding effective population size was 67 individuals. The effective population size based on the variance in progeny group was 235 ponies. On average, each year 10 new stallions and 81 new mares were used in breeding every year. The majority of stallions used in breeding had between 1 and 20 registered offspring.
The DNA profiles from 344 horses were analysed. In total 16 markers were considered. FIS, a measure of inbreeding related to the subpopulation, was 0.014 when considering all 344 animals as a single population. The expected level of heterozygosity was 0.643 while the observed was 0.635. One marker, AHT5, was found not to be in Hardy-Weinberg equilibrium, indicating some kind of selection. |
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