Fine Mapping QTL for mastitis resistance on BTA9 in three Nordic red cattle breeds

G Sahana; M S Lund; L Andersson-Eklund; N Hastings; A Fernandez; T Iso-Touru; B Thomsen; S Viitala; P Sørensen; J L Williams; J Vilkki

doi:10.1111/j.1365-2052.2008.01729.x

Fine Mapping QTL for mastitis resistance on BTA9 in three Nordic red cattle breeds

G Sahana, M S Lund, L Andersson-Eklund, N Hastings, A Fernandez, T Iso-Touru, B Thomsen, S Viitala, P Sørensen, J L Williams, J Vilkki

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Abstract

A QTL affecting clinical mastitis and/or somatic cell score (SCS) has been reported previously on chromosome 9 from studies in 16 families from the Swedish Red and White (SRB), Finnish Ayrshire (FA) and Danish Red (DR) breeds. In order to refine the QTL location, 67 markers were genotyped over the whole chromosome in the 16 original families and 18 additional half-sib families. This enabled linkage disequilibrium information to be used in the analysis. Data were analysed by an approach that combines information from linkage and linkage disequilibrium, which allowed the QTL affecting clinical mastitis to be mapped to a small interval (BM4208 and INRA084. This QTL showed a pleiotropic effect on SCS in the DR and SRB breeds. Haplotypes associated with variations in mastitis resistance were identified. The haplotypes were predictive in the general population and can be used in marker-assisted selection. Pleiotropic effects of the mastitis QTL were studied for three milk production traits and eight udder conformation traits. This QTL was also associated with yield traits in DR but not in FA or SRB. No QTL were found for udder conformation traits on chromosome 9

Original language	English
Journal	Animal Genetics
Volume	39
Issue	4
Pages (from-to)	354-362
Number of pages	9
ISSN	0268-9146
DOIs	https://doi.org/10.1111/j.1365-2052.2008.01729.x
Publication status	Published - 2008

Keywords

dairy cattle
mastitis
quantitative trait loci
somatic cell score

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10.1111/j.1365-2052.2008.01729.x

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title = "Fine Mapping QTL for mastitis resistance on BTA9 in three Nordic red cattle breeds",

abstract = "A QTL affecting clinical mastitis and/or somatic cell score (SCS) has been reported previously on chromosome 9 from studies in 16 families from the Swedish Red and White (SRB), Finnish Ayrshire (FA) and Danish Red (DR) breeds. In order to refine the QTL location, 67 markers were genotyped over the whole chromosome in the 16 original families and 18 additional half-sib families. This enabled linkage disequilibrium information to be used in the analysis. Data were analysed by an approach that combines information from linkage and linkage disequilibrium, which allowed the QTL affecting clinical mastitis to be mapped to a small interval (BM4208 and INRA084. This QTL showed a pleiotropic effect on SCS in the DR and SRB breeds. Haplotypes associated with variations in mastitis resistance were identified. The haplotypes were predictive in the general population and can be used in marker-assisted selection. Pleiotropic effects of the mastitis QTL were studied for three milk production traits and eight udder conformation traits. This QTL was also associated with yield traits in DR but not in FA or SRB. No QTL were found for udder conformation traits on chromosome 9",

keywords = "dairy cattle, mastitis, quantitative trait loci, somatic cell score",

author = "G Sahana and Lund, {M S} and L Andersson-Eklund and N Hastings and A Fernandez and T Iso-Touru and B Thomsen and S Viitala and P S{\o}rensen and Williams, {J L} and J Vilkki",

year = "2008",

doi = "10.1111/j.1365-2052.2008.01729.x",

language = "English",

volume = "39",

pages = "354--362",

journal = "Animal Genetics",

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T1 - Fine Mapping QTL for mastitis resistance on BTA9 in three Nordic red cattle breeds

AU - Sahana, G

AU - Lund, M S

AU - Andersson-Eklund, L

AU - Hastings, N

AU - Fernandez, A

AU - Iso-Touru, T

AU - Thomsen, B

AU - Viitala, S

AU - Sørensen, P

AU - Williams, J L

AU - Vilkki, J

PY - 2008

Y1 - 2008

N2 - A QTL affecting clinical mastitis and/or somatic cell score (SCS) has been reported previously on chromosome 9 from studies in 16 families from the Swedish Red and White (SRB), Finnish Ayrshire (FA) and Danish Red (DR) breeds. In order to refine the QTL location, 67 markers were genotyped over the whole chromosome in the 16 original families and 18 additional half-sib families. This enabled linkage disequilibrium information to be used in the analysis. Data were analysed by an approach that combines information from linkage and linkage disequilibrium, which allowed the QTL affecting clinical mastitis to be mapped to a small interval (BM4208 and INRA084. This QTL showed a pleiotropic effect on SCS in the DR and SRB breeds. Haplotypes associated with variations in mastitis resistance were identified. The haplotypes were predictive in the general population and can be used in marker-assisted selection. Pleiotropic effects of the mastitis QTL were studied for three milk production traits and eight udder conformation traits. This QTL was also associated with yield traits in DR but not in FA or SRB. No QTL were found for udder conformation traits on chromosome 9

AB - A QTL affecting clinical mastitis and/or somatic cell score (SCS) has been reported previously on chromosome 9 from studies in 16 families from the Swedish Red and White (SRB), Finnish Ayrshire (FA) and Danish Red (DR) breeds. In order to refine the QTL location, 67 markers were genotyped over the whole chromosome in the 16 original families and 18 additional half-sib families. This enabled linkage disequilibrium information to be used in the analysis. Data were analysed by an approach that combines information from linkage and linkage disequilibrium, which allowed the QTL affecting clinical mastitis to be mapped to a small interval (BM4208 and INRA084. This QTL showed a pleiotropic effect on SCS in the DR and SRB breeds. Haplotypes associated with variations in mastitis resistance were identified. The haplotypes were predictive in the general population and can be used in marker-assisted selection. Pleiotropic effects of the mastitis QTL were studied for three milk production traits and eight udder conformation traits. This QTL was also associated with yield traits in DR but not in FA or SRB. No QTL were found for udder conformation traits on chromosome 9

KW - dairy cattle

KW - mastitis

KW - quantitative trait loci

KW - somatic cell score

U2 - 10.1111/j.1365-2052.2008.01729.x

DO - 10.1111/j.1365-2052.2008.01729.x

M3 - Journal article

SN - 0268-9146

VL - 39

SP - 354

EP - 362

JO - Animal Genetics

JF - Animal Genetics

IS - 4

ER -

Fine Mapping QTL for mastitis resistance on BTA9 in three Nordic red cattle breeds

Abstract

Keywords

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