Validation of single-step genomic BLUP random regression test-day models and SNP effects analysis on milk yield in French Saanen goats

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Arnal, M. | Robert-Granié, C. | Ducrocq, V. | Larroque, H.

Edité par CCSD -

International audience. The shape of the lactation curve is linked to an animal's health, feed requirements, and milk production throughout the year. Random regression models (RRM) are widely used for genetic evaluation of total milk production throughout the lactation and for milk yield persistency. Genomic information used with the stantially improves the accuracy of genomic prediction of breeding values in the main dairy cattle breeds. The aim of this study was to implement an RRM using ssGBLUP for milk yield in Saanen dairy goats in France. The data set consisted of 7,904,246 test-day records France between 2000 and 2017. The performance of this type of evaluation was assessed by applying a validation was compared with a nongenomic evaluation and a traditional evaluation that use cumulated performance throughout the lactation model (LM). The incorporation of genomic information increased correlations between daughter yield deviations (DYD) and estimated breeding values (EBV) obtained with a partial data set for candidate bucks. The LM and the RRM had the RRM reduced overestimation of EBV and improved the slope of the regression of DYD on EBV obtained at birth. This study shows that a genomic evaluation from of persistency. Variance of adjacent SNPs was studied sociated with persistency were also found.

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