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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.
Equipment needed:
- CMT paddle
- Gloves
- Reagent
- Recording sheet
How to do the California milk test (CMT)
![1. Foremilk each quarter..](https://projectblue.blob.core.windows.net/media/Default/Dairy/1drycow.jpg)
![2. Draw 2-3 squirts of milk from each.](https://projectblue.blob.core.windows.net/media/Default/Dairy/2drycow.jpg)
![a cup of tea](https://projectblue.blob.core.windows.net/media/Default/Dairy/3drycow.jpg)
Remember
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).
![graphical user interface](https://projectblue.blob.core.windows.net/media/Default/Dairy/4drycow.jpg)