Somatic Cell Count
Somatic Cell Count in Milk · Also known as: SCC, mastitis indicator, milk quality assessment
Somatic Cell Count (SCC) is a quantitative measure of the concentration of white blood cells and epithelial cells in milk, used as a primary indicator of udder health and the presence of mastitis in lactating cattle. Standardized by veterinary regulatory agencies worldwide, SCC serves as a non-invasive, cost-effective screening tool in dairy herd management and milk quality assessment.
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When to use it
SCC is applied routinely in dairy operations for herd health monitoring, usually monthly or at each milk collection in automated systems. It is essential for early detection of subclinical mastitis, quality assurance in milk production, and regulatory compliance. SCC is mandated in milk quality testing in most developed countries and is increasingly required for premium milk pricing.
Strengths & limitations
- Non-invasive; requires only milk samples without stressing the animal
- Rapid automated analysis; results available within hours using modern flow cytometry systems
- Standardized across laboratories and internationally recognized for milk quality standards
- Cost-effective screening for subclinical mastitis, enabling preventive intervention before production loss
- Objective quantitative measure reducing observer bias
- Elevated SCC can result from inflammation, infection, physiological stress, or environmental factors; not diagnostic of specific pathogens
- Individual cow SCC can vary naturally with lactation stage, parity, and genetics; threshold interpretation requires context
- Does not distinguish between types of somatic cells (neutrophils, macrophages, lymphocytes, epithelial cells) without differential count
- Requires specialized equipment and trained personnel for reliable automated analysis
Frequently asked
What is a normal somatic cell count?
A normal SCC is typically below 200,000 cells/mL for individual cow samples. Regulatory thresholds vary globally: the European Union requires <400,000 cells/mL for bulk milk, while the United States allows <800,000 cells/mL. Higher thresholds reflect risk stratification for milk quality and food safety.
Why can SCC be elevated without clinical mastitis?
Somatic cells increase in response to various stressors: subclinical infection (most common), udder irritation from milking technique, heat stress, nutritional deficiency, or hormonal changes during the lactation cycle. Elevated SCC is a signal for investigation, not a diagnosis of mastitis alone.
How often should SCC be monitored?
In modern dairy operations, SCC is typically monitored monthly via bulk milk samples at milk collection or continuously in real-time systems integrated into automatic milking machines. Individual cow SCC is often measured at each milking in robotic systems, enabling rapid detection of changes.
Can SCC be reduced without antibiotics?
Yes. Management strategies such as improving milking hygiene, optimizing milking machine settings, enhancing nutrition (especially zinc and vitamin E), reducing stress, and maintaining clean housing can lower SCC. Antibiotics are reserved for confirmed bacterial infections; their use is increasingly restricted for routine SCC elevation.
Sources
- Philippidis, G. P., Frey, H. R., & Klug, C. (2016). Somatic cell count and milk production in dairy cattle. Journal of Dairy Science, 99(2), 1419-1427. link ↗
- Pyörälä, S. (2003). Indicators of inflammation in the diagnosis of mastitis. Veterinary Research, 34(5), 565-578. link ↗
- FAO Animal Production and Health Division (2019). Milk quality and livestock standards. Food and Agriculture Organization of the United Nations. link ↗
How to cite this page
ScholarGate. (2026, June 3). Somatic Cell Count in Milk. ScholarGate. https://scholargate.app/en/veterinary-science/somatic-cell-count
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