Abstract

The VikingRed breeding program received the first genomic enhanced breeding values (GEBV) from Nordic Cattle Breeding Evaluation (NAV) in autumn 2009. Genetic trends are compared for both bulls and females between two periods, 2001-2008 and 2009-2016. The data consists of records on 3,104 AI-bulls and more than 2.4 million females. 14 traits included in the Nordic Total Merit index (NTM) are included in this study. All studied traits, in both males and females, have had a positive genetic trend since the introduction of genomic selection (GS). The annual genetic progress, both before and after the introduction of GS, was highest in NTM, yield index, udder conformation and longevity for both males and females. The traits with the largest genetic improvement in bulls, after the introduction of GS, are feet & legs, daughter fertility, longevity, mastitis resistance, claw health, yield index and birth index. The improvement of the individual traits generated a major increase of the NTM. The traits with the largest improvement in females, since 2009, are claw health, young stock survival, feet & legs and daughter fertility. The genetic progress has been larger in the end of the ”genomic era” than in the beginning. A gradual adjustment of the breeding program has occurred; improvement of reliability of GEBV, increase of selection intensity through a reduction of the number of AI-bulls and a decrease of the generation interval through the promotion of young bulls as sires in the breeding program and an increased proportion of females inseminated with semen from superior young genomic tested bulls. Keywords: Stålhammar, Red dairy cattle, GEBV, genetic gain

Hans Stålhammar

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Biology & Species - Bovine (dairy) 1, , 443, 2018
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