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Genomic selection experiment in Lacaune dairy sheep: progeny test results of rams initially selected either on parent average or on genomic prediction
Genomic selection experiment in Lacaune dairy sheep : progeny test results of rams initially selected either on parent average or on genomic prediction
ABSTRACT: A genomic selection experiment was carried out for the AI dairy Lacaune rams born in 2011: within 46 sires, 200 and 128 sons have been progeny tested, respectively after usual parent average preselection (classical rams), or after a genomic preselection of around one third (genomic rams). The superiority of the genomic rams (GR) compared to classical rams (CR) for the total merit index (TMI) was underestimated by 58 % using BLUP versus using single-step GBLUP: the true breeding value superiority of GR compared to CR was estimated to 0.52 TMI standard deviation, so that only 24 % of GR were eliminated versus 48 % of CR according to the TMI threshold used to select the proven rams.
Keywords: dairy sheep
Lacaune breed
Genomic Selection
Experiment
