nordisk avlsværdivurdering predictive ability of different models for clinical mastitis in joint...
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Nordisk AvlsværdivurderingNordisk Avlsværdivurdering
Predictive ability of different models for clinical mastitis in joint genetic
evaluation for Sweden, Denmark and Finland
K. Johansson1, S. Eriksson4, J. Pösö2, U. Sander Nielsen3 and G. Pedersen Aamand5
Nordisk Avlsværdivurdering
Udder health
• A part of robustness
• Important for – Animal Welfare– Economy – Labour
Nordisk Avlsværdivurdering
Udder health selection
Which traits h2
• Clinical mastitis (CM) 0.03
• Somatic cellcount (SCC) 0.12
• Udder conformation (UC) 0.30
Nordisk Avlsværdivurdering
Aim
Study predictive ability for different multiple trait alternatives
Data
Red Dairy Cattle (DNK, FIN, SWE)
Procedure
Divide data in early and late part,
estimate correlations
Nordisk Avlsværdivurdering
Procedure
• Calculate sire breeding values from different models in early data
• Correlate with CM daughter group means or sire breeding values from late data
• Cows with data in the early dataset was abandoned in the
late data
Early EBV Late CM-means or EBVs
1984 2002 2003 2006
Nordisk Avlsværdivurdering
Proven bulls
Early data
• First daughter group
~100 daughters
Late data
• Second daughter group
~1400 daughters
Born 1992-1995
Nordisk Avlsværdivurdering
Young bulls
Early data
• Pedigree information
Late data
• First daughter group• ~100 daughters
Born 1997-2000
Nordisk Avlsværdivurdering
Traits
Traits period h2 Index w.
CM11 -15 to 50 0.03 0.25
CM12 51 to 300 0.02 0.25
CM2 -15 to 150 0.03 0.3
CM3 -15 to 150 0.03 0.2
SCC1 5 to 150 0.14
SCC2 5 to 150 0.13
SCC3 5 to 150 0.11
U. attach. 1st lact. 0.24
U. depth 1st lact. 0.36
Nordisk Avlsværdivurdering
Genetic correlations for indicator traits
CM - SCC 0.55 - 0.65
CM – Udder conformation -0.35 - -0.55
Nordisk Avlsværdivurdering
selection
bull sire
Information on bull sires at different stages of selection
CM11 CM12 CM2 CM3
SCC1 SCC2 SCC3
UC
selection newborn bull calves
Selection
young bulls
Nordisk Avlsværdivurdering
Correlations between EBVs from early data and daughter group means from late data.
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
CM- SCC-UC
CM-SCC CM-UC CM SCC- UC SCC UC
means proven bulls
means young bulls
Nordisk Avlsværdivurdering
Correlations between EBVs from early data and daughter group means from late data.
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
CM- SCC-UC
CM-SCC CM-UC CM SCC- UC SCC UC
means proven bulls
means young bulls
Nordisk Avlsværdivurdering
Correlations between EBVs from early data and daughter group means from late data.
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
CM-SCC- UC
CM-SCC CM-UC CM SCC- UC SCC UC
means proven bulls
means young bulls
Nordisk Avlsværdivurdering
Correlations between EBVs from early data and daughter group means from late data.
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
CM-SCC- UC
CM-SCC CM-UC CM SCC- UC SCC UC
means proven bulls
means young bulls
Nordisk Avlsværdivurdering
Correlations between EBVs from early data and EBVs from late data
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
CM-SCC-UC
CM-SCC CM-UC CM SCC-UC SCC UC
ebv proven bulls
ebv young bulls
Nordisk Avlsværdivurdering
Summing up
-Prediction of clinical mastitis is improved by
•Inclusion of CM records
•Inclusion of SCC or UC records together with CM records
Nordisk Avlsværdivurdering
Summing up-UC is important
•In young bull selection
•In first stage of bull sire selection
Nordisk Avlsværdivurdering
selection
bull sire
Information on bull sires at different stages of selection
M11 M12 M2 M3
SCC1 SCC2 SCC3
UC
selection newborn bull calves
Selection
young bulls
Nordisk Avlsværdivurdering
Summing up-UC is important
•In young bull selection
•In first stage of bull sire selection
Nordisk Avlsværdivurdering
Summing up-UC is important
-Both proven bull and young bull information can be used when evaluating models
•In young bull selection
•In first stage of bull sire selection
Nordisk Avlsværdivurdering
Thank You!
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