origin of northern european cattle breeds · origin of northern european cattle breeds a.a....
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Origin of Northern European
cattle breeds
A.A. Schönherz1 V.H. Nielsen2 B. Guldbrandtsen1
1Center for Quantitative Genetics and Genomics2Danish Center for Agriculture
Aarhus University
November 30, 2018
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Where are the data from?
Traditional Danish Breeds
• Danish GenomeManagement Project
• Nina Poulsen (Food Science, AU)
Nordic Reference Breeds
• 1000 Bull GenomesProject
• Islandic Cattle Federation
European Reference Breeds
• 1000 Bull GenomesProject
• WIDDE (INRA, France)
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Red Danish Dairy Cattle
Traditional Danish
Origin in 19th century
Native Danish cattle crossed with Schleswig cattle
Angler
Ballum (extinct)
North Schleswig cattle (extinct)
Traditionally dual-purpose
1950 ~1 million animals
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Red Danish Conservation Breed
Since 1970, increased focus on milk production
Crossbreeding with Brown Swiss, Holstein, and recently
Nordic Red led to modern Danish RDC (RDCDNK)
Tiny remnant population of pure bred conservation
breed (RDM 1970) ~200 animals
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Genotype Data
A
T
T
A
G
C
A
T
C
G
G
C
Marker (SNP)
Observe almost 800.000 positions in genome
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Breed History with Molecular Data
Genetic differentiation of Northern European cattle
Population structure
Relationships among breeds
Breed origin
Detection of admixture
Genomic inbreeding
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PCA
SDM65
HOL
SHO
RDM70
RDCJER
BSW
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PCA
Old Danish Red very different from modern SWE, NOR, FIN Red
RDM70
Nordic Red
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PCA
Modern Danish Red very diverse
RDCDNK
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Pre-crossbreeding (1970s)
Danish Red distinct cluster
RDM70
BSW
RDCSWERDCNOR
RDCFINHOLDNK
SDM-65
tRDM
cRDM-70
Old Angler
New Angler
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Pre-crossbreeding (1970s)
Angler and old Danish Red similar
Angler
RDM70
BSW
RDCSWERDCNOR
RDCFINHOLDNK
SDM-65
tRDM
cRDM-70
Old Angler
New Angler
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Crossbreeding in 1980s:
Extensive crossing with Brown Swiss
BSW
RDCDNK 80s
BSW
RDCSWERDCNOR
RDCFINHOLDNK
SDM-65
tRDM
cRDM-70
Old Angler
New AnglermRDCDNK 80ies
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Crossbreeding in 1990s:
BSW
RDCSWERDCNOR
RDCFINHOLDNK
SDM-65
tRDM
cRDM-70
Old Angler
New Angler
mRDCDNK 80ies
mRDCDNK 90ies
Extensive crossing with Holstein
HOL
RDCDNK 90s
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After 2000:
Crossing with Swedish and Finnish Red
Nordic Red
RDCDNK 2000
BSW
RDCSWERDCNOR
RDCFINHOLDNK
SDM-65
tRDM
cRDM-70
Old Angler
New Angler
mRDCDNK 80ies
mRDCDNK 90ies
mRDCDNK after 2000
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Admixture
Detects distinct breed ancestries
Ancestry proportions evaluated for each number of
ancestries
Ancestries can be breed specific or shared among breeds
An individual's ancestry is proportionally attributed to the
ancestry components
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How to read admixture
One breed
Vertical bar: individual
Color: ancestry
Red Cattle Origin (3 ancestries)
0.2
0.6
1.0
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Admixture
tANG
BSW
cRDM-70
GUE
HER
HIN
HOL
ICC
JER
JYS
MON
MYR
NOR
RDCDEU
RDCDNK
RDCFIN
RDCNOR
RDCSWE
RDP
RED
SDM-65
SHO
SIM
tRDM
VORVOS
Heterogeneous
breed
Homogeneous
breed
*
*
*
*
*
* highly admixed
mislabeled animals
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Admixture
RDCSWE RDCFINRDCNOR
tANGDEU RDCDEU
tRDM cRDM-70 mRDCDNK
BSW
Geographic gradient
Confirm DK distinct from
other Scandinavian RDC
Modern RDC DNK
synthetic breed
HOL SDM-65
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TreeMix – Migrations
Reconstructs relationships between populations
Infers migration events between diverged populations
Root: N´Dama (Afr. taurine)
N´Dama: West African taurine breed
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TreeMix – Migrations
North West European
Holstein clade
RDM-70 clade
Nordic Red clade
Alpine Dairy clade
BSW clade
Complex migrations among Scandinavian breeds
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Pedigree vs. Genomic Inbreeding
Pedigree inbreeding
Traceable
Incomplete pedigrees
Incorrect pedigrees
Genomic inbreeding
Reliable (insensitive to pedigree errors)
Independent of pedigree
Traces both old and recent events
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Runs of Homozygosity
Inbreeding detected through homozygous regions (ROH)
Fraction of ROH in genome measures inbreeding (FROH)
FROH > FPED
In time, ROH decay through recombination
Short ROH reflect (potentially very) old events
Long ROH reflect recent inbreeding
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Genomic Inbreeding (FROH)
Individual with the highest FROH
(53.51%)
Oldest bull in genebank (18.80%)
cRDM 1970:Old RDM:
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Genomic Inbreeding (FROH)
20.71
14.51
0.60
31.51
20.59
12.95
10.38
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Conclusions – Danish Red Breeds
Genebank and living old Danish Red are close
Old Danish Red related to Angler
Old Danish Red very different from modern SWE, NOR,
FIN Red cattle
Modern Danish Red is a synthetic breed, admixed with
Brown Swiss, Holstein, and Norther Red
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Conclusions
Northern and Central European cattle group into 5
clades plus island breeds
Alpine, Brown Swiss, Holstein, Nordic Red, and Danish
Red
Old Danish Red only pure bred representative of its
clade
Grouping of island breeds unclear
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Management
Admixture identifies disagreement between breed label
and molecular data
Would not be known without molecular information!
Could lead to unwanted admixture