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Quantitative trait loci mapping in dairy cattle: review and meta-analysis
Mehar S Khatkar1, Peter C Thomson, Imke Tammen
1Centre for Advanced Technologies in Animal Genetics and Reproduction (ReproGen), and Co-operative Research Centre for Innovative Dairy Products, Faculty of Veterinary Science, University of Sydney, PMB 3, Camden NSW 2570, Australia.
Genetics, Selection, Evolution : GSE
|March 26, 2004
Summary
Researchers mapped dairy cattle quantitative trait loci (QTL) for production traits. A meta-analysis identified consensus regions for milk yield, including two on chromosome 6, highlighting their importance for dairy breeding.
Area of Science:
- Animal Genetics and Genomics
- Quantitative Trait Loci (QTL) analysis
- Dairy Cattle Breeding
Background:
- Extensive public domain data on dairy cattle quantitative trait loci (QTL) is available.
- Previous studies predominantly focused on major milk production traits and somatic cell score.
- Limited QTL studies exist for complex traits like mastitis, fertility, and health in dairy cattle.
Purpose of the Study:
- To compile a draft online QTL map for dairy production traits.
- To identify consensus QTL locations and allelic substitution effects through meta-analysis.
- To pinpoint chromosomal regions with high QTL density and specific QTL impacts.
Main Methods:
- Comprehensive review of public domain information on dairy cattle QTL.
- Development and application of modified statistical methodologies for meta-analysis.
- Collating QTL data to create a unified QTL map and identify consensus regions.
Main Results:
- A draft online QTL map for dairy production traits was created.
- Meta-analysis identified consensus regions, notably two on chromosome 6 affecting milk yield.
- These regions explained significant genetic variance in milk yield (4.2% and 3.6%) and influenced multiple production traits.
Conclusions:
- The study provides a valuable resource for dairy cattle genetic improvement.
- Consensus regions, particularly on chromosome 6, are critical targets for marker-assisted selection.
- Further research is needed for QTL related to complex dairy cattle traits.