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

Publikation: Bidrag til bog/antologi/rapport/proceedingKonferenceabstrakt i proceedingsForskningpeer 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
TitelBook of Abstracts of the 64th Annual Meeting of the European Association for Animal Production
Antal sider1
UdgivelsesstedThe Netherlands
ForlagWageningen Academic Publishers
Udgivelsesår26 aug. 2013
ISBN (trykt)978-90-8686-228-3
StatusUdgivet - 26 aug. 2013
Begivenhed64th Annual Meeting of the European Federation of Anmal Science - La Cité Nantes Events Centre, Nantes, Frankrig
Varighed: 26 aug. 201330 sep. 2013
Konferencens nummer: 64th


Konference64th Annual Meeting of the European Federation of Anmal Science
LokationLa Cité Nantes Events Centre

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