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Somatic cell count and clinical mastitis are traits that are directly related to udder health. Because of their direct influence on costs of milk production they are generally considered to be an important factor in maximizing profit from dairy industry globally. Nordic countries (Denmark, Finland, Norway and Sweden) are the only countries with well-established, national recording systems for health data in dairy cattle and the only to include clinical mastitis (CM) directly in the breeding programs. Additionally, the longstanding exchange of genetic material (bull semen) across Nordic countries has created a sufficient genetic link between dairy populations which could be utilized for improving udder health through joint across-country testing and evaluation of bulls and cows. Joint testing and evaluation between Nordic countries allows accurate comparison and selection of bulls and cows across borders and leads eventually to more efficient utilization of knowledge and resources in genetic evaluation (Juga, 2002). There are, however, some differences between countries in terms of the definition of udder health traits, the parameters, number of lactations considered and most importantly the models used for the genetic evaluation. In most cases the models used so far consider SCC and CM separately in genetic evaluation of dairy bulls and cows. Basically the inclusion of traits genetically correlated to mastitis in the same evaluation can enhance breeding for increased resistance to mastitis. Besides, the statistical information contained in a categorical trait like CM is small and therefore a multi-trait model i.e. a combined analysis of mastitis with a correlated trait (SCC) as an additional source of information will be preferred to increase the accuracy of genetic evaluation. The main objective of this study was to develop multitrait-multiparity (MT-MP) model for the joint genetic evaluation of Nordic bulls for udder health traits.

Multitrait-multiparity model for joint genetic evaluation of Nordic bulls for udder health traits