National evaluation for calving ease, gestation length and birth weight by linear and threshold model methodologies
2002
Lee, D. | Misztal, I. | Bertrand, K. | Rekaya, R. (Georgia University, Athens (USA). Dept. of Animal and Dairy Science)
Data included 393 097 calving ease, 129 520 gestation length, and 412 484 birth weight records on 412 484 Gelbvieh cattle. Additionally, pedigrees were available on 72 123 animals. Included in the models were effects of sex and age of dam, treates as fixed, as well as direct, maternal genetic and permanent environmental effects and effects of contemporary group, treated as random. In all analyses, birth weight and gestation length were treated as continuous traits. Calving ease was treated either as a continuous trait in a mixed linear model or as a categorical trait in linear-threshold models. Solutions in threshold model obtained by empirical Bayes and Monte Carlo methodologies were compared with those by linear model
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