Genetic parameters of conformation traits in norwegian red cattle estimated with a multiple trait model

In Norway an extended recording of conformation traits provides a large amount of information on daughter groups of young artificial insemination bulls. In order to improve the use of the information in sire evaluation, an estimation of correlations and heritabilities of selected traits was done using a data set containing 14 320 records on Norwegian Red Cattle heifers from 1983 and 1984. Variances and covariances were estimated with a multiple trait model using a canonical transformation of the dataset and maximum likelihood procedures. Results indicated a good genetic basis for selection on distance floor to rear teats and distance between front teats. Estimated heritabilities for linearly scored udder and ‘body and legs’ scores were low (about 0.05). All traits were adjusted for height at withers and heart girth.