title: Comparison of milk protein allele frequencies in Nordic cattle breeds.
abstract: Allele frequencies at four milk protein loci were studied in five modern and 17 old Nordic cattle breeds in order to reveal variants that are characteristic for these populations. The B allele of CSN3, which has been associated with improved manufacturing properties of milk, showed significantly lower frequencies in modern production breeds than in old breeds of interest for conservation purposes. Characteristic frequencies of CSN1S1 (C), CSN2 (A2) and CSN3 (B) were found in Icelandic cattle, Swedish Mountain cattle, Northern Finncattle and Western Fjord cattle, which indicate a common origin of these populations. Further comparisons of allele frequencies in old Nordic breeds suggest sorting of these breeds into two groups with a northern and southern geographic location.
authors.affiliation: Department of Animal Science, Agricultural University of Norway, Aas, Norway.
authors.forename: S
authors.initials: S
authors.lastname: Lien
authors.forename: J
authors.initials: J
authors.lastname: Kantanen
authors.forename: I
authors.initials: I
authors.lastname: Olsaker
authors.forename: L E
authors.initials: LE
authors.lastname: Holm
authors.forename: E
authors.initials: E
authors.lastname: Eythorsdottir
authors.forename: K
authors.initials: K
authors.lastname: Sandberg
authors.forename: B
authors.initials: B
authors.lastname: Dalsgard
authors.forename: S
authors.initials: S
authors.lastname: Adalsteinsson
mesh_terms: D000483:Alleles; D000818:Animals; D001947:Breeding; D002417:Cattle / Q000235:genetics*; D004247:DNA / Q000737:chemistry; D016002:Discriminant Analysis; D005260:Female; D005787:Gene Frequency; D008040:Genetic Linkage / Q000235:genetics; D014644:Genetic Variation / Q000235:genetics; D005838:Genotype; D007055:Iceland; D008894:Milk Proteins / Q000235:genetics*; D012537:Scandinavian and Nordic Countries
chemical_list: D008894:Milk Proteins; D004247:DNA