Four Nordic countries (Denmark, Finland, Norway and Sweden) have agreed on joint testing and use of AI-bulls. To enable accurate comparison and selection of bulls and cows across countries a joint genetic evaluation based on Nordic data is needed. In order to gain general acceptance the joint Nordic evaluation model has to be at least as good as the current national models and exploit optimally the genetic links between the countries. At the present, genetic evaluation of production traits in Finland is based on test day (TD) observations whereas in Sweden and Norway 305d lactation records are used. In Denmark genetic evaluation will soon move from using only 305d records to include both TD and 305d records. Consequently, the joint Nordic animal model for production traits should be able to deal with both types of records. The objectives of this study were to apply an evaluation model fitting both TD and lactation records using Nordic data and to compare results to those from individual withincountry evaluations. 

J. Pso, Esa A Mäntysaari

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.15, 2002
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