How to use Delvotest

Taking a sample of an individual cow's milk

When analysing cow's milk, the tank must contain samples from all four quarters as milk from non-treated quarters may also be infected. You should also be careful not to use the foremilk as this may give an inaccurate antibiotic reading.

Take a sample of tank milk

Stir the milk in the tank before taking a sample to ensure the sample taken is representative of the whole tank.

Step 1: Preparation
Cut off the required number of ampoules with a pair of scissors. Be careful not to damage the foil of the remaining ampoules.

Step 2: Open the seal
Open ampoule(s) by punching a hole in the aluminum foil with the syringe. Mark the ampoules for sample identification.

Step 3: Take a milk sample
Attach a new disposable pipette to the syringe. Depress the plunger completely, dip the tip in the milk sample and allow the plunger to return slowly under pressure of the spring.

Step 4: Inoculation
Empty the syringe into the correspondingly marked ampoule by slowly depressing the plunger of the syringe. Use a fresh disposable pipette for each milk sample.

Step 5: Incubation
Check the temperature of the incubator (64ºC ±0.5ºC). Put the ampoule(s) into the incubator. Record the time and set timer for 3 hours or use control time.

Step 6: Results
After 3 hours, remove the samples from the incubator. Read the colour of the lower 2/3 part of the solid agar in the ampoule(s) after the required incubation time.