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Longitudinal Analysis of Somatic Cell Count for Joint Genetic Evaluation of Mastitis and Recovery Liability
Stockholm University, Faculty of Social Sciences, Department of Statistics.
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2014 (English)In: Proceedings, 10th World Congress of Genetics Applied to Livestock Production, 2014, 095Conference paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. 095
Keyword [en]
Mastitis liability, Recovery liability, Somatic cell count
National Category
Agricultural Sciences Probability Theory and Statistics
URN: urn:nbn:se:su:diva-135879OAI: diva2:1049654
10th World Congress on Genetics Applied to Livestock Production (WCGALP), Vancouver, Canada, 17-22 August, 2014

"Genetics of Trait Complexes: Disease resistance", number 095.

Available from: 2016-11-25 Created: 2016-11-25 Last updated: 2016-12-09Bibliographically approved

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Franzén, Jessica
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Department of Statistics
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