Open AccessJournal Article
Approximate multitrait BLUP evaluation to combine functional traits information
TL;DR: In this paper, an approximate multiple trait BLUP sire model is proposed, using deregressed proofs or daughter deviations to build the right hand side of the mixed model equations.
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Abstract: We present an alternative to the classical way of combining breeding values into a total merit index, traditionally based on selection index principles. An approximate multiple trait BLUP sire model is proposed, using deregressed proofs or preferably daughter deviations to build the right hand side of the mixed model equations. The advantages of the proposed approach are: a) a unique definition of the weight for each individual trait in the total merit index (independent from the accuracy of each index); b) new estimated breeding values for each individual trait, optimally combining direct and indirect information; c) the possibility to account for residual covariances between performances of a same animal (in contrast with MACE methodology). An algorithm for an easier solution of the multivariate system of linear equations is proposed as well as a possible extension to the computation of female EBVs. This approach is still to be implemented and tested.
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Citations
Accuracies of univariate and multivariate genomic prediction models in African cassava
Uche Godfrey Okeke,Deniz Akdemir,Ismail Y. Rabbi,Peter Kulakow,Jean-Luc Jannink,Jean-Luc Jannink +5 more
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Methods to Combine Estimated Breeding Values Obtained from Separate Sources
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Genetic parameters for type and functional traits in the French Holstein breed
TL;DR: An approximate estimation of genetic correlations in the French Holstein breed based on MACE methodology applied to A.I. bulls evaluations is presented, finding that prediction of functional longevity could be improved by udder depth and temperament, somatic cell counts by milking speed and uDder depth, and female fertility by temperament and rump angle.
References
Multiple-Country Comparison of Dairy Sires
TL;DR: A multiple-trait sire model was described in which yields of daughters in different countries were considered to be different traits, which appears to be better theoretically than methods in which the genetic correlations among countries are assumed to be 1.
327
Solution of multiple trait animal models with missing data on some traits.
Vincent Ducrocq,B. Besbes +1 more
TL;DR: A simple method based on an EM argument and replacing missing records by their expectation given the current parameters allows the use of the canonical transformation in situations where data are missing and selection is ignorable.
69
•Journal Article
Topics that may deserve further attention in survival analysis applied to dairy cattle breeding: some suggestions
TL;DR: Some potential directions for further research in modelling include the computation of cow EBVs, the use of timedependent sire effects, the implementation of multivariate analyses, the definition of survival traits on a lactation basis and the investigation of culling components.
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•Journal Article
An indirect approach for the estimation of genetic correlations between longevity and other traits
H Larroque,V Ducrocq +1 more
TL;DR: This study throws light on the danger of this procedure when some assumptions are not checked beforehand and the existence of non zero residual variances or a choice of bulls with unreliable evaluations may lead to biased or fluctuating results.
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