Nordisk Avlsværdivurdering Predictive ability of different models for clinical mastitis in joint genetic evaluation for Sweden, Denmark and Finland K.

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Presentation transcript:

Nordisk Avlsværdivurdering Predictive ability of different models for clinical mastitis in joint genetic evaluation for Sweden, Denmark and Finland K. Johansson 1, S. Eriksson 4, J. Pösö 2, U. Sander Nielsen 3 and G. Pedersen Aamand 5

Nordisk Avlsværdivurdering Udder health A part of robustness Important for –Animal Welfare –Economy –Labour

Nordisk Avlsværdivurdering Udder health selection Which traits h 2 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

Nordisk Avlsværdivurdering Proven bulls Early data First daughter group ~100 daughters Late data Second daughter group ~1400 daughters Born

Nordisk Avlsværdivurdering Young bulls Early data Pedigree information Late data First daughter group ~100 daughters Born

Nordisk Avlsværdivurdering Traits periodh2h2 Index w. CM11-15 to CM1251 to CM2-15 to CM3-15 to SCC15 to SCC25 to SCC35 to U. attach.1st lact.0.24 U. depth1st lact.0.36

Nordisk Avlsværdivurdering Genetic correlations for indicator traits CM - SCC CM – Udder conformation

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

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!