Somatic cell count (SCC) has been widely advocated as an indicator trait for mastitis. In many countries, SCC is measured on a large scale in national milk recording systems (usually at a monthly basis) and used as an indirect criterion to achieve selection for mastitis resistance (Mrode and Swanson, 1996). Genetic models for SCC are mostly based on lactation average of somatic cell scores (SCS = log transformed SCC to achieve normality of distribution). Use of models for test day observations (Reents et al., 1995) should, however, better account for short term environmental variation and allow to use all information without restriction on the number of records available or length of time intervals. Therefore, genetic evaluation of this trait should be improved. To that respect, test day models may also account more precisely for short time variation of SCC than lactation models and be more efficient to predict clinical cases and infections in general. 

C. Robert-Granie, E. Maza, R. Rupp, J. L Foulley

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 16, , 16.05, 2002
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