Presence of black-brown fibers in wool from Corriedale sheep is recognized as a fault, which limits the competitiveness of wool with other textile fibers and reduces its value. Hierarchical models were introduced with the aim to define strategies for reducing its incidence. We compared Poisson and zero-inflated Poisson (ZIP) regression models, with or without random residual term in the model, through simulated data. Models with residual term performed better than the others, grounded in their flexibility. Poisson with residual was the best model when considered by the end-points, despite poor estimates under ZIP scenarios. All models displayed good correlation between "true" and predicted breeding values, especially zero-inflated Poisson with residuals, which maintain its ability among scenarios.

H. Naya, Jorge I Urioste, Y. M Chang, Rodrigues M. Motta, R. Kremer, Daniel Gianola

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 24.09, 2006
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