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Inbreeding Depression and Purging in Fertility and Longevity Traits in Sheep Breeds from Germany
Cathrin Justinski1, Jens Wilkens2, Ottmar Distl1
1Institute of Animal Breeding and Genetics, University of Veterinary Medicine Hannover (Foundation), 30559 Hannover, Germany.
Animals : an Open Access Journal From MDPI
|November 27, 2024
Summary
This study on 22 German sheep breeds found that fertility and longevity traits are heritable and negatively impacted by inbreeding. Prioritizing these traits is crucial for genetic diversity conservation in sheep breeding programs.
Area of Science:
- Animal Genetics
- Quantitative Genetics
- Livestock Breeding
Background:
- Fertility and longevity are key fitness traits in livestock.
- Understanding their genetic basis and response to inbreeding is vital for sustainable breeding.
- German sheep breeds offer a valuable dataset for such analyses.
Purpose of the Study:
- To analyze fertility and longevity traits in 22 German sheep breeds.
- To estimate heritability for traits like lambing number and lifetime production.
- To investigate the impact of inbreeding on these fitness traits.
Main Methods:
- Utilized data from the OviCap national database, including 62,198 ewes and ~173,000 lambing records.
- Calculated across-breed heritability estimates for various fertility and longevity traits.
- Assessed inbreeding depression and purging effects on these traits across breeds.
Main Results:
- Heritability estimates ranged from 0.13 to 0.34 for different traits.
- Significant negative inbreeding depression was observed for reproductive and lifetime production traits.
- Purging effects reduced inbreeding depression in eight breeds.
Conclusions:
- Fertility and longevity traits are heritable and sensitive to inbreeding.
- Sheep breeding programs should prioritize these fitness traits for genetic diversity.
- Selection strategies must consider the interplay between selection and inbreeding depression.
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