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Genome-wide association analysis for feed efficiency in Angus cattle
M M Rolf1, J F Taylor, R D Schnabel
1Division of Animal Sciences, University of Missouri, Columbia, 65211, USA. mmr5x7@mail.missouri.edu
Animal Genetics
|April 14, 2012
Summary
Genomic analysis identified significant single nucleotide polymorphisms (SNPs) associated with feed efficiency traits in Angus steers. These SNPs explain substantial genetic variation and highlight metabolic gene functions, aiding in breeding value prediction.
Area of Science:
- Animal Genetics and Genomics
- Quantitative Genetics
- Livestock Production
Background:
- Accurate estimation of breeding values for feed efficiency traits is crucial for sustainable cattle production.
- Genomic selection offers a powerful tool to improve traits like average daily feed intake (AFI), residual feed intake (RFI), and average daily gain (ADG).
- Understanding the genetic architecture underlying feed efficiency can accelerate genetic gain in beef cattle.
Purpose of the Study:
- To identify single nucleotide polymorphisms (SNPs) associated with estimated breeding values (EBVs) for AFI, RFI, and ADG in Angus steers.
- To determine the proportion of additive genetic variation explained by significant SNPs for feed efficiency traits.
- To explore the potential biological functions of genes located in genomic regions associated with these traits.
Main Methods:
- A mixed linear model incorporating genomic relationships was used for 698 Angus steers genotyped with the Illumina BovineSNP50 assay.
- Genome-wide association analyses were performed for EBVs of AFI, RFI, and ADG, with significance thresholds established by permutation analysis.
- A forward selection algorithm identified significant SNPs and their associated genomic regions, followed by pathway analysis.
Main Results:
- A total of 53, 66, and 68 SNPs explained significant portions of the additive genetic variation for AFI (54.12%), RFI (62.69%), and ADG (55.13%), respectively.
- Pathway analysis indicated that many associated SNPs are located in genomic regions containing genes with metabolic functions.
- Genetic correlations between traits were observed, with some SNPs selected for AFI and RFI also being significant for ADG.
Conclusions:
- This study successfully identified panels of SNPs significantly associated with feed efficiency traits in the studied Angus steer population.
- The identified SNPs and associated genes provide valuable targets for improving feed efficiency through genomic selection.
- Further validation of these SNPs in independent populations is recommended for potential commercial application in breeding programs.
