%0 Journal Article %1 Wiggans20084058 %A Wiggans, G.R. %A Tsuruta, S. %A Misztal, I. %D 2008 %J Journal of Dairy Science %K 2008 dairy_cattle %N 10 %P 4058 - 4061 %R http://dx.doi.org/10.3168/jds.2007-0955 %T Technical note: Adaptation of an animal-model method for approximation of reliabilities to a sire-maternal grandsire model %U http://www.sciencedirect.com/science/article/pii/S0022030208710373 %V 91 %X A method used to approximate reliabilities for animal models was modified to estimate reliabilities for sire-maternal grandsire (MGS) models. Accuracy of the approximation was tested on a calving-ease data set for 2,968 bulls for which the inverse of the coefficient matrix could be obtained. Correlations between estimated and true reliabilities ranged from 0.984 to 0.998 for first- and later-parity calving ease for sire and \MGS\ effects. With no modification of the animal-model procedure, \MGS\ identification was treated as if it were dam identification, which resulted in overestimated reliability. When pedigree information was ignored, reliability was underestimated. Correlations with true values were lower for both of those cases when compared with correct processing of \MGS\ information. The modification provided a slight improvement over assuming \MGS\ to be unknown and will be used for routine \USDA\ evaluation of calving traits.

@article{Wiggans20084058, abstract = {A method used to approximate reliabilities for animal models was modified to estimate reliabilities for sire-maternal grandsire (MGS) models. Accuracy of the approximation was tested on a calving-ease data set for 2,968 bulls for which the inverse of the coefficient matrix could be obtained. Correlations between estimated and true reliabilities ranged from 0.984 to 0.998 for first- and later-parity calving ease for sire and \{MGS\} effects. With no modification of the animal-model procedure, \{MGS\} identification was treated as if it were dam identification, which resulted in overestimated reliability. When pedigree information was ignored, reliability was underestimated. Correlations with true values were lower for both of those cases when compared with correct processing of \{MGS\} information. The modification provided a slight improvement over assuming \{MGS\} to be unknown and will be used for routine \{USDA\} evaluation of calving traits. }, added-at = {2016-05-18T04:10:29.000+0200}, author = {Wiggans, G.R. and Tsuruta, S. and Misztal, I.}, biburl = {https://www.bibsonomy.org/bibtex/21b41ca74df125c17a64fd97277e6a2e4/uga.abgg}, doi = {http://dx.doi.org/10.3168/jds.2007-0955}, interhash = {425018805ffecb644f0efc5f2fe1a7bf}, intrahash = {1b41ca74df125c17a64fd97277e6a2e4}, issn = {0022-0302}, journal = {Journal of Dairy Science }, keywords = {2008 dairy_cattle}, number = 10, pages = {4058 - 4061}, timestamp = {2016-05-18T04:10:29.000+0200}, title = {Technical note: Adaptation of an animal-model method for approximation of reliabilities to a sire-maternal grandsire model }, url = {http://www.sciencedirect.com/science/article/pii/S0022030208710373}, volume = 91, year = 2008 }