Functional traits have become more and more important in dairy cattle, particularly in the Holstein breed, highly selected for production in the past. Functional longevity (Ducrocq, 1987) has become a common way of measuring fitness of the cows. This is particularly the case when secondary traits are not fully recorded, such as in the Spanish Holstein population. Survival analysis techniques are considered the method of choice for the analysis of longevity data due to their ability of managing incomplete records and allowing a more proper modelling of this type of data (Strandberg and Sölkner, 1996 ; Essl, 1998 ; Boettcher et al., 1998). The aim of this paper was to analyse longevity data from the Spanish Holstein cattle using survival analysis techniques in order to propose a genetic evaluation model for this population.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.72, 2002
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