Food and beverage
Milk from several farms in one tank
The moment two farms share a tank they share a fate. The question is not whether to mix, but what is kept before mixing.
The collection route calls at six farms and fills a tanker. The moment the second discharges onto the first, there is no way to separate what each contributed. From then on the whole tanker is worth whatever the worst of the six is worth — and that is not a technical problem, it is why a sample is taken at every stop.
What decides everything, and happens before mixing
| Moment | What is decided there |
|---|---|
| **The sample at the farm** | **The only evidence of what each contributed** |
| The rapid test before loading | Whether a problem gets in or stays out |
| The record of which farms are on each tanker | Whether you can look back afterwards |
| Discharge at the plant | From here the batch belongs to everyone |
Important
**An unidentified sample is worthless, and it is the commonest failure.** A sample that does not say which farm, which day and which collection is exactly as useful as not having taken one: when a result forces you to look back, you will not be able to attribute it to anyone and the cost gets shared among everyone on that tanker. Labelling the sample properly takes seconds and is the only thing separating an incident from a dispute.
What is worth settling in advance
- 1
What happens if a test fails with the tanker already loaded
Decided beforehand, not at the plant gate.
- 2
How long samples are kept and under what conditions
They are worth little if badly stored, and that is discovered late.
- 3
Who bears the cost and in which cases
Written into the collection contract, not agreed in the heat of it.
- 4
And how the affected farm is told
Fast, because their next milking is already on its way.
Watch out
An effect forgotten when designing routes: **collection order matters**. The farm loaded first cannot be tested separately once the tanker is full, and the last one conditions all the others. If a holding has a patchy history, putting it last does not improve it — but it completely changes how much milk is put at risk while checks run, and that is a decision genuinely in your hands.
Worth knowing
Which controls and samples raw milk collection requires, how often and what limits apply is set by the applicable hygiene rules and by agreements with the industry. **Your quality manager settles that**; here we cover the organisational part: what is kept before mixing erases the origin.
›Can I tell which farm a problem came from?
Only if that collection's sample is identified and properly stored.
›What if the result arrives once the milk is processed?
Then the sample is the only thing that bounds it. Hence keeping it.
›Is testing before loading worth it?
It is what decides whether the problem enters the tanker or stays out.
A real case
The situation
A result forces a look backwards and the samples do not say which farm they are from.
What you do
- Labels every sample with farm, day and collection at the moment of taking it
What you get
The incident is attributed to whoever it belongs to instead of shared among six.
The situation
A test fails with the tanker loaded and it gets decided at the plant gate.
What you do
- Writes down beforehand what happens in that case and who bears what
What you get
The decision is taken on criteria rather than with a lorry waiting.
The situation
A holding with a patchy history is first on the route.
What you do
- Reviews the collection order against risk
What you get
Less milk is put at risk while checks are carried out.
The situation
Two farms share a tank and there is no record of what went in first.
What you do
- Records each intake before mixing
What you get
The trace survives the blend.
The situation
An analysis comes back poor and affects the whole tank.
What you do
- Checks which farms made up that tank
What you get
You know who is affected and who is not.
The situation
Collection is noted on the delivery slip and gets lost.
What you do
- Captures the slip at the collection itself
What you get
The record does not travel in the cab.
This article answers
- traceability of milk from several farms
- milk samples per farm
- the tank mixes the collection
- milk testing before discharge