Improvement of milk and fat yields is the most important breeding goals in dairy cattle in Iran. BLUP evaluation of the animals for these traits, which has been implemented currently, is based on repeated-records animal model. In spite of large data set for milk and fat yields of Iran Holstein, there is no single-trait or repeated-records animal model estimates of variance components for these traits. Since, the available genetic parameters were estimated from few herds with small number of observations, using Henderson’s methods (Henderson, 1953) and sire model, pooled values of variance components, derived from literature, are used for national genetic evaluation program

A. S Jahanshahi, R. V Torshizi, N. EJ Kashan, M. BS Nejad

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.71, 2002
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