Antibiotics and Milk
As a dairy farm, we understand the significance of antibiotics in milk. We also understand, that their can be no antibiotic residue in our milk, or we will be penalized. By that I mean, we wouldn’t
get paid for the milk we ship that day (2 days worth of milk), and we would also have to buy the other milk on the truck with ours. That adds up to tens of thousands of dollars in loss!! So there are a few things we have to
do to make sure this doesn’t happen.
Withdrawal time
All antibiotics have a withdrawal time. That means there is a certain length of time that the antibiotic residue is in the milk, and that milk cannot be shipped out until that time passes. Usually it is anywhere
from 2-4 days. During that time the cows milk is milked into a bucket and dumped, so it doesn’t contaminate the rest of the milk.
Process of milking a Cow that has been treated with an antibiotic
So basically it’s the same as it is for mother’s breastfeeding babies. We have to pump and dump. We hook the milker up to a bucket to keep the milk seperate. Once it is done, we dump the milk
and wash everything. If the equipment isn’t washed out properly, that little bit of milk can contaminate the entire bulk tank. If there is concern that this has happened, we have a special machine we can use to test
a sample of milk to make sure it is not contaminated. If that test were to ever come back positive, we would have to dump the entire tank down the drain and sanitize the inside of the tank. Which is expensive, but cheaper
than buying the whole truck load.
What happens if you ship milk with antibiotic residue in it?
When the milk truck driver arrives at a farm, he takes a milk sample. He does this at each individual farm. When he arrives at the milk plant, they take a sample from the truck. If that sample comes back
positive for antibiotics, they test all of the farm samples to find out which farm caused the contamination. That farm is then responsible for buying the milk of all the other farms on that route. That gets very expensive!!
No farm wants to lose a large amount of money, so very strict precautions are taken so that doesn’t happen. We have to make sure the cow that has been treated is clearly marked, their milk is put into
a bucket and dumped, and everything is washed after.
milkfacts.info is a good website, with a lot of information. Click on Microbiology to see more about regulations of antibiotics and bacteria in milk.