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Genetic improvement of mastitis through selection on somatic cell count
1Department of Dairy Science, University of Wisconsin-Madison.
The Veterinary Clinics of North America. Food Animal Practice
|November 1, 1993
Summary
Genetic selection can reduce mastitis susceptibility in dairy cattle. Breeding for desirable somatic cell score alongside milk production traits is key to improving herd health and reducing clinical mastitis.
Area of Science:
- Animal Genetics
- Dairy Science
- Veterinary Epidemiology
Background:
- Clinical mastitis and elevated somatic cell score (SCS) are significant concerns in dairy cattle health.
- Heredity plays a crucial role in the susceptibility to both clinical mastitis and SCS.
- Intramammary infection is the primary driver of increased SCS.
Purpose of the Study:
- To introduce a nationwide genetic evaluation program for dairy cattle somatic cell score.
- To guide artificial insemination (AI) sire selection for improved dairy cattle health.
- To mitigate the genetic increase in mastitis susceptibility linked to high milk production selection.
Main Methods:
- Genetic evaluation for somatic cell score in dairy populations.
- Analysis of the genetic correlation between milk production and mastitis/SCS traits.
- Development of selection strategies for AI sires.
Main Results:
- A nationwide genetic evaluation for SCS is under development.
- Selection for high milk production can inadvertently increase mastitis susceptibility.
- Considering SCS in sire selection is essential for balanced genetic improvement.
Conclusions:
- Genetic selection is a viable strategy to reduce mastitis susceptibility in dairy herds.
- Integrating SCS into genetic evaluations is critical for sustainable dairy farming.
- Balanced selection of AI sires considering both production and health traits is recommended.