California milk test for dairy cows
By testing each quarter individually, the California milk test (CMT) can indicate which quarter has a raised cell count. This test can help to detect mastitis.
What is a California milk test (CMT)?
The test uses a reagent that is added to a sample of milk. If the test is positive and a quarter is infected, the CMT mixture will appear thickened and gel-like.
- CMT paddle
- Recording sheet
How to do the California milk test (CMT)
Should any of the rings appear thickened and gel-like, this indicates a positive test.
Watch our short film which shows how to perform a CMT, along with the results that might be seen.
Grading reactions to CMT
Rather than just ‘positive’ or ‘negative’, the CMT reaction can be graded on a scale of 0–3. With experience, a user may also be able to estimate the SCC (although this is by no means an accurate determinant).