A new type of random regressions based on biological differences among repeated records and its application to longevity is presented. This method uses biological differences among repeated records as an approximation of expected a priory change in genetic merit and (co)variances across those repetitions. A practical application of the method is presented that allowed the development of a genetic evaluation system of cow survival using a lactation random regression model equivalent to a 17 trait lactation survival model. This model is currently used in the Walloon Region of Belgium for routine genetic evaluation.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 25.08, 2006
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