Question

Which of the following methods is commonly used to test for mastitis on a farm?

• A. Somatic cell count (SCC)
• B. California Mastitis Test (CMT)
• C. Aerobic plate count/Standard plate count
• D. Fat content test

Hint:

Whenever you see "on a farm" or "cow-side" test for mastitis, associate it directly with the California Mastitis Test (CMT), which provides an immediate visual gel reaction in the milking parlor.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Detecting subclinical mastitis on the farm requires a rapid, simple, and inexpensive "cow-side" test that can be performed easily by dairy farmers during milking.

Step 2: Detailed Explanation:
- California Mastitis Test (CMT): This is the standard cow-side diagnostic test used on farms. It involves mixing milk from each teat with a detergent reagent. If somatic cells are present, the reagent lyses them and causes their DNA to form a visible gel, providing an immediate estimate of infection severity.
- Somatic Cell Count (SCC) & Standard Plate Count (SPC): These are more precise laboratory-based diagnostic tests that require specialized equipment and are not typically performed directly on the farm during milking.
- Fat Content Test: Used to determine the nutritional value and payment rate of milk, not to detect mastitis.

Step 3: Final Answer
The most common cow-side method used to test for mastitis on the farm is the California Mastitis Test (CMT).