095
Longitudinal Analysis of Somatic Cell Count for Joint Genetic Evaluation of Mastitis and Recovery Liability

Tuesday, August 19, 2014: 1:45 PM
Bayshore Grand Ballroom E-F (The Westin Bayshore)
B.G. Welderufael , Center for Quantitative Genetics and Genomics, Department of Molecular Biology and Genetics, Aarhus University, Tjele, Denmark
D.J. de Koning , Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
L. Janss , Center for Quantitative Genetics and Genomics, Department of Molecular Biology and Genetics, Aarhus University, Tjele, Denmark
J. Franzén , Department of Statistics, Stockholm University, Stockholm, Sweden
W. F. Fikse , Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Uppsala, Sweden
Recorded Presentation (flv)
Abstract Text:

Better models of genetic evaluation for mastitis can be developed through longitudinal analysis of somatic cell count (SCC) which usually is used as a proxy for mastitis. Mastitis and recovery data with weekly observations of SCC were simulated for daughter groups of 60 and 240 per sire. Data were created to define cases: 1 if SCC was above a pre-specified boundary, else 0. A transition from below to above the boundary indicates probability to contract mastitis, and the other way indicates recovery. The MCMCglmm package was used to estimate breeding values. In the 60 daughters group, accuracies ranged from 0.53 to 0.54 for mastitis and 0.22 to 0.23 for recovery. Whereas, in the 240 daughters group accuracies ranged from 0.83 to 0.85 for mastitis and 0.57 to 0.65 for recovery. Reasonable accuracies can be achieved from SCC based estimates.

Keywords:

Mastitis liability

Recovery liability

Somatic cell count

See more of: Variance Components and Indicators of Disease Resistance
See more of: Genetics of Trait Complexes: Disease resistance
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