SUMMARY Unrelated purebred sheep from 10 breeds (25/breed), including North Country Cheviot, Suffolk, Romanov, Texel, Cheviot, Icelandic, Finnsheep, Dorset, Scottish Blackface and Red Masai were genotyped at 10 microsatellite loci. Samples of 1000 purebred and 1= individuals were generated by Monte Carlo simulation using observed allele frequency distributions. Individuals were assigned to one of the 10 breeds where likelihood for the genotypes was maximum. A modified maximum likelihood (ML) procedure was used to assign samples of 500 simulated individuals to all possible purebred and crossbred groups, using combined allele frequency distributions of the breeds involved in each cross. Large differences among the 10 breeds for allele frequency distributions at the microsatellite loci resulted in 97.9% to 99.9% correct assignment of purebred individuals. Small numbers of F, individuals were correctly assigned to the parental breeds, and in most cases a larger number was assigned to unrelated breeds, indicating that allele frequency distributions of purebred breeds are not appropriate for assignment of crossbred animals. The modified maximum likelihood procedure resulted in correct assignment of 53% to 87% of crossbred animals.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 208–211, 1998
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