Genomic selection of milk fatty acid composition in Sarda dairy sheep: Effect of different phenotypes and relationship matrices on heritability and breeding value accuracy

Journal of Dairy Science
A CesaraniN P P Macciotta

Abstract

Fatty acid (FA) composition is one of the most important aspects of milk nutritional quality. However, the inclusion of this trait as a breeding goal for dairy species is hampered by the logistics and high costs of phenotype recording. Fourier-transform infrared spectroscopy (FTIR) is a valid and cheap alternative to laboratory gas chromatography (GC) for predicting milk FA composition. Moreover, as for other novel phenotypes, the efficiency of selection for these traits can be enhanced by using genomic data. The objective of this research was to compare traditional versus genomic selection approaches for estimating genetic parameters and breeding values of milk fatty acid composition in dairy sheep using either GC-measured or FTIR-predicted FA as phenotypes. Milk FA profiles were available for a total of 923 Sarda breed ewes. The youngest 100 had their own phenotype masked to mimic selection candidates. Pedigree relationship information and genotypes were available for 923 and 769 ewes, respectively. Three statistical approaches were used: the classical-pedigree-based BLUP, the genomic BLUP that considers the genomic relationship matrix G, and the single-step genomic BLUP (ssGBLUP) where pedigree and genomic relationship matri...Continue Reading

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Citations

Apr 2, 2020·Animals : an Open Access Journal From MDPI·Chen WeiWensheng Zhao
Dec 18, 2020·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·Valentino PalomboMariasilvia D'Andrea
Dec 20, 2020·Animals : an Open Access Journal From MDPI·Tania BobboMartino Cassandro
Jan 21, 2021·Animals : an Open Access Journal From MDPI·Héctor MarinaJuan José Arranz
Feb 1, 2021·Journal of Dairy Science·F CorredduN P P Macciotta
Jun 29, 2021·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·Laura FalchiNicolò P P Macciotta

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