Original Research ARTICLE
Joint genomic prediction of canine hip dysplasia in UK and US Labrador Retrievers
- 1The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, United Kingdom
- 2University of Nottingham, United Kingdom
- 3Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, United States
Canine hip dysplasia, a debilitating orthopedic disorder that leads to osteoarthritis and cartilage degeneration, is common in several large-sized dog breeds and shows moderate heritability suggesting that selection can reduce prevalence. Estimating genomic breeding values require large reference populations, which are expensive to genotype for development of genomic prediction tools. Combining datasets from different countries could be an option to help build larger reference datasets without incurring extra genotyping costs. Our objective was to evaluate genomic prediction based on a combination of UK and US datasets of genotyped dogs with records of Norberg angle scores, related to canine hip dysplasia.
Prediction accuracies using a single population were 0.179 and 0.290 for 1179 and 242 UK and US Labrador Retrievers, respectively. Prediction accuracies changed to 0.189 and 0.260, with an increased bias of genomic breeding values when using a joint training set (biased upwards for the US population and downwards for the UK population).
Our results show that in this study of canine hip dysplasia, little or no benefit was gained from using a joint training set, as compared to using a single population as training set. We attribute this to differences in the genetic background of the two populations, as well as the small sample size of the US dataset.
Keywords: Canine hip dysplasia, genomic selection, Labrador retrievers, Genomic best linear unbiased prediction, Joint reference population
Received: 22 Dec 2017;
Accepted: 13 Mar 2018.
Edited by:Rohan L. Fernando, Iowa State University, United States
Reviewed by:Maja Ferenčaković, Faculty of Agriculture, University of Zagreb, Croatia
Solomon A. Boison, Nofima, Norway
Copyright: © 2018 Edwards, Williams, Hickey, Blott, Clements, Sánchez-Molano, Todhunter and Wiener. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Pam Wiener, University of Edinburgh, The Roslin Institute and Royal (Dick) School of Veterinary Studies, Edinburgh, United Kingdom, Pam.Wiener@roslin.ed.ac.uk