Abstract

Genomic analyses of claw health traits in Holstein cattle I. Croué1,2,3, A. Michenet3 & V. Ducrocq1 1INRA, 2Institut de l’Élevage and 3ALLICE, UMR1313 GABI, 78352 Jouy-en-Josas Cedex, France iola.croue@inra.fr (Corresponding author) Claw lesions are one of the most impactful health issues in dairy cattle. Our objectives were to compare various genetic and genomic evaluation methods, to identify the most suitable one for the evaluation of seven claw lesion traits and to identify QTLs having a strong influence on these traits. 46 787 cows with own performances (including 7 333 genotyped cows) and their ancestors were analyzed with BLUP, GBLUP, BayesC and single-step genomic BLUP (SSGBLUP), in a validation study. QTLs were detected using a BayesC approach. Among all evaluation approaches, SSGBLUP performed best in terms of accuracy and control of bias. However, accuracies of all evaluation approaches were generally low. In total, over all lesion traits, 161 QTLs with strong evidence were found, including 5 with major evidence and 6 overlapping QTL regions for at least two traits. Genomic approaches and the use of QTL seem promising for the genetic evaluation of claw health traits. Keywords: claw health, genomic evaluation, QTL, validation study

Iola Croué, Alexis Michenet, Vincent Ducrocq

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Biology & Species - Bovine (dairy) 1, , 228, 2018
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