California mastitis test

California Mastitis Test Schalmtestplatte

California Mastitis Test

The California Mastitis Test (CMT) is a diagnostic tool used in the dairy industry to detect mastitis in dairy cattle. Mastitis is an inflammation of the udder tissue, typically caused by bacterial infection, which can lead to decreased milk production and quality. The CMT is a simple, rapid, and cost-effective method for identifying subclinical mastitis, which does not show visible symptoms but can still affect milk yield and quality.

History

The California Mastitis Test was developed in the 1950s by researchers at the University of California, Davis. It was designed to provide a quick and reliable method for dairy farmers to monitor the health of their herds and manage mastitis more effectively.

Procedure

The CMT involves mixing a small sample of milk from each quarter of the cow's udder with a reagent in a special paddle. The reagent reacts with the somatic cells present in the milk. Somatic cells are white blood cells that increase in number in response to infection. The degree of gel formation in the mixture indicates the level of somatic cells, which correlates with the presence and severity of mastitis.

Steps

1. Clean the teats of the cow to avoid contamination. 2. Discard the first few streams of milk. 3. Collect milk samples from each quarter into the corresponding wells of the CMT paddle. 4. Add an equal amount of CMT reagent to each well. 5. Swirl the paddle gently to mix the milk and reagent. 6. Observe the reaction and score the results based on the degree of gel formation.

Interpretation of Results

The results of the CMT are scored on a scale from 0 to 3:

• 0: No gel formation, indicating a low somatic cell count and no mastitis.
• 1: Slight gel formation, indicating a moderate somatic cell count and possible subclinical mastitis.
• 2: Distinct gel formation, indicating a high somatic cell count and likely subclinical mastitis.
• 3: Strong gel formation, indicating a very high somatic cell count and clinical mastitis.

Advantages

• Quick and easy to perform on the farm.
• Cost-effective compared to laboratory tests.
• Provides immediate results, allowing for prompt management decisions.

Limitations

• Subjective interpretation of results can lead to variability.
• Not as precise as laboratory-based somatic cell count tests.
• May not detect all cases of mastitis, especially in early stages.

Related Pages

• Mastitis
• Dairy farming
• Somatic cell count
• University of California, Davis

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