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Genome-wide association study for bone strength in laying hens
Biaty Raymond1, Anna Maria Johansson1, Heather Anne McCormack2
1Swedish University of Agricultural Sciences, Department of Animal Breeding and Genetics, Uppsala, Sweden.
Journal of Animal Science
|April 28, 2018
Summary
Genetic factors significantly influence bone strength in laying hens, offering a path to reduce fractures through selective breeding. This study identified key genetic regions linked to improved bone health and hen welfare.
Area of Science:
- Animal Genetics
- Poultry Science
- Animal Welfare
Background:
- Bone fractures in egg-laying hens present a significant welfare and economic challenge within the poultry industry.
- While environmental and nutritional factors can worsen bone weakness, a genetic basis is strongly suspected as the primary cause.
Purpose of the Study:
- To conduct a genome-wide association study (GWAS) to pinpoint genetic loci associated with bone strength in laying hens.
- To identify specific quantitative trait loci (QTLs) and candidate genes influencing tibial breaking strength.
Main Methods:
- Genotype and phenotype data were collected from 752 purebred laying hens.
- Genome-wide genotyping utilized 580,961 single nucleotide polymorphisms (SNPs), with 232,021 SNPs passing quality control.
- Family-based score tests for association were employed to analyze SNP associations with tibial breaking strength.
Main Results:
- Fifty-two SNPs on chromosomes 1, 3, 8, and 16 showed significant association with tibial breaking strength (P < 10e-5).
- Five distinct QTLs were identified, with the strongest association on chromosome 8 (corrected P = 4e-7).
- Candidate genes, including BRD2, and pathways like chloride channel activity and intermediate filament organization, were implicated in bone physiology.
Conclusions:
- The study confirms that bone strength in laying hens is substantially regulated by genetic factors.
- Identification of specific QTLs and candidate genes provides a foundation for genetic selection strategies.
- Implementing genetic selection can lead to reduced bone fractures, thereby enhancing hen welfare and industry sustainability.
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