Genotyping cows for the reference increase reliability of genomic prediction in a small breed

Jørn Rind Thomasen, Anders Christian Sørensen, Mogens Sandø Lund, Bernt Guldbrandtsen

Research output: Contribution to book/anthology/report/proceedingConference abstract in proceedingsResearchpeer-review


We hypothesized that adding cows to the reference population in a breed with a small number of reference bulls would increase reliabilities of genomic breeding values and genetic gain. We tested this premise by comparing two strategies for maintaining the reference population for genetic gain, inbreeding and reliabilities of genomic predictions: 1) Adding 60 progeny tested bulls each year (B), and 2) in addition to 60 progeny tested bulls, adding 2,000 genotyped cows per year (C). Two breeding schemes were tested: 1) A turbo scheme (T) with only genotyped young bulls used intensively, and 2) a hybrid breeding scheme (H) with use of both genotyped young bulls and progeny tested bulls. The genomic selection schemes were simulated over 15 years, and the reference population of the first year of genomic selection consisted of approximately 1000 progeny tested bulls. T-B yielded 8.6% higher ∆G compared to the H-B, at the same level of ∆F. T-C yielded 15% higher ∆G compared t o T-B. Changing the breeding scheme from H-B to H-C increased ∆G by 5.5%. The lowest ∆F was observed with genotyping of cows. Reliabilities of GEBV in the C schemes showed a steep increase in reliability during the first four years, from 0.2 to just above 0.4. With B schemes the reliability increased from 0.19 to 0.27. Genotyping cows for the reference population increases genetic gain, particularly in breeding schemes with intense use of young bulls
Original languageEnglish
Title of host publicationBook of Abstracts of the 64th Annual Meeting of the European Association for Animal Production
Number of pages1
Place of publicationThe Netherlands
PublisherWageningen Academic Publishers
Publication date26 Aug 2013
ISBN (Print)978-90-8686-228-3
Publication statusPublished - 26 Aug 2013
Event64th Annual Meeting of the European Federation of Anmal Science - La Cité Nantes Events Centre, Nantes, France
Duration: 26 Aug 201330 Sept 2013
Conference number: 64th


Conference64th Annual Meeting of the European Federation of Anmal Science
LocationLa Cité Nantes Events Centre


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