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Evidence for quantitative trait loci affecting ovulation rate in pigs
T A Rathje1, G A Rohrer, R K Johnson
1Department of Animal Science, University of Nebraska, Lincoln 68583-0908, USA.
Journal of Animal Science
|June 1, 1997
Summary
Researchers identified a significant quantitative trait loci (QTL) for ovulation rate in pigs on chromosome 8. This finding could advance marker-assisted selection for improved swine reproduction traits.
Area of Science:
- Animal Genetics
- Reproductive Biology
- Quantitative Genetics
Background:
- Selective breeding impacts swine reproductive performance.
- Understanding genetic control of ovulation rate is crucial for improving litter size.
Purpose of the Study:
- To identify quantitative trait loci (QTL) influencing ovulation rate and litter traits in pigs.
- To investigate genetic markers for enhanced swine reproduction.
Main Methods:
- Scoring 55 microsatellite markers in an F2 pig population (n=114).
- Utilizing regression models with random animal effects and likelihood-ratio tests for QTL analysis.
- Recording ovulation rate and fetal development data.
Main Results:
- A significant QTL for ovulation rate was detected on chromosome 8 (P < .001) with a substantial additive effect.
- Potential QTL for ovulation rate were indicated on chromosomes 4, 13, and 15, though not reaching stringent significance thresholds.
- No significant QTL were identified for litter size or the number of mummified pigs.
Conclusions:
- Chromosome 8 harbors a major QTL affecting ovulation rate in pigs.
- Further research is needed to validate these QTL and their associated markers for marker-assisted selection.
- Genetic insights into ovulation rate can guide future breeding strategies for swine.