In the first part of a data set on elbow dysplasia in dogs (n=188) variance components and breeding values of animals were computed. Observations in the second part (n=65) were subsequently regressed on estimated breeding values. A direct effects model was found inappropriate: although a high heritability was found (0.53), regression of new observations on the pedigree index was -0.25. In a maternal effects model heritability was 0.34, and the relevant regression of new observations on the breeding value of the dam was 1.1, around its expected value of 1. Regressions on breeding values of grandparents revealed a possibly more complex inheritance and offers interesting starting points for further investigations. This case showed that an incorrect choice of model, here the direct effects model, could work counterproductive for prediction of new observations. 

L. LG Janss, E. W Brascamp

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programmes;, , 621–624, 1998
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