Breeding Value Estimation for Environmental Sensitivity on a Large Dairy Cattle Data Set

L. Ronnegard, W.F. Fikse, H.A. Mulder, E. Strandberg

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

Abstract

Animal robustness, or environmental sensitivity, may be studied through individual differences in re-sidual variance. These differences appear to be heritable, and there is therefore a need to fit models having breeding values explaining differences in residual variance. The aim of this report is to study whether breeding value estimation for environmental sensitivity (vEBV) can be performed on a large dairy cattle data set having around 1.6 million records. Two traits were analyzed separately, somatic cell score and milk yield. Estimation of variance components, ordinary breeding values and vEBVs was performed using standard variance component estimation software (ASReml), applying the me-thodology for double hierarchical generalized linear models. Converged estimates were obtained by running ASReml iteratively 20 times, which took less than 10 days on a Linux server. The genetic co-efficients of variation for environmental variance were 0.45 and 0.52, for somatic cell score and milk yield, respectively, which indicate a substantial genetic variance for environmental variance. This study shows that estimation of variance components, EBVs and vEBVs, is feasible for large dairy cat-tle data sets using standard variance component estimation software.
Original languageEnglish
Title of host publicationProceedings of the 2011 Interbull meeting, 26-29 August 2011, Stavanger, Norway
Pages110-113
Volume44
Publication statusPublished - 2011
Event2011 Interbull meeting, Stavanger, Norway -
Duration: 27 Aug 201129 Aug 2011

Conference

Conference2011 Interbull meeting, Stavanger, Norway
Period27/08/1129/08/11

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