Templates and records · GMP+
Carry-over control in feed manufacturing
Whatever stays in the line from one batch passes into the next. With coccidiostats or medicines, that residue can take the feed outside the law.
In one sentence
Carry-over control in feed manufacturing measures the percentage of one batch that passes into the next on each line and sets production sequences, flushes and checks so that non-target feeds do not exceed the limits for additives, coccidiostats or medicines, as GMP+ and European legislation on unavoidable carry-over and medicated feed require.
- Type of information
- Mandatory record Measurement and records required by GMP+ B1, with the limits in Directive 2009/8/EC and Regulation (EU) 2019/4
- Who fills it in
- Quality and production Quality designs the measurement; production applies sequencing and flushes
- When
- Periodic measurement and after changes When the line is installed or modified; sequencing and flush records for every batch
- How long it is kept
- As set by the scheme and the law Regulation (EC) 183/2005 requires records that allow traceability, and the GMP+ documents set minimum retention periods: check them in the current version of the B document that applies to you.
What the standard requires
What GMP+ demands and what it leaves to your judgement
GMP+ requires the carry-over of each production installation to be known, measured with a reliable method at an appropriate frequency, and controlled with measures such as production sequencing, flushes or dedicated lines.
The limits come from legislation: Directive 2009/8/EC sets maximum levels of coccidiostats and histomonostats from unavoidable carry-over in non-target feed, and Regulation (EU) 2019/4 regulates cross-contamination in the manufacture of medicated feed.
The hazard analysis identifies which feeds are sensitive — target species, final finishing phases, animals producing milk or eggs — and therefore where carry-over is critical.
Structure
Fields the template should include
- Line or installation
- Measurement method and tracer
- Result: carry-over percentage
- Date of measurement and next one
- Sensitive feeds and applicable limits
- Defined production sequences
- Flushes: material, quantity and destination
- Record per batch of the sequence applied
Example
Example: poultry feed line at a fictitious feed mill
Company, people and figures are fictitious: the example only shows what a properly completed record looks like.
| Field | Content |
|---|---|
| Line | Line 2 · mixer, pellet press and product bin |
| Measurement | Manganese oxide tracer · 10 samples from the next batch |
| Result | 2.8% carry-over · March 2026 |
| Sensitive feed | Withdrawal feed for broilers, without coccidiostat |
| Sequence | Feed with coccidiostat → grower feed with the same additive → flush → withdrawal feed |
| Flush | 500 kg of cereal · reincorporated into a feed with the same additive |
| Next measurement | March 2027 or after changes to the line |
At the audit
Mistakes auditors commonly flag
- Carry-over measured once years ago and never repeated.
- Defined sequences that are not recorded per batch.
- Flushes that end up in a sensitive feed.
- Withdrawal feeds made straight after a medicated one.
- Measurement with a method that is not representative.
In Kimobox
How this record is kept in Kimobox
- 1Carry-over measurements are recorded by line with their result and the date of the next one, with a reminder.
- 2Production sequences and flushes are linked to each batch.
- 3A breach of the sequence opens a nonconformity with the affected batch already identified.
- 4Analytical results for sensitive feeds are compared against their limits.
Frequently asked questions
What people ask us before getting started
What is carry-over?
The percentage of a batch that remains in the installation and mixes with the next batch. It is expressed as a percentage and depends on the design of the line.
How is it measured?
With a tracer — an additive or a substance that is easy to analyse — added to one batch and looked for in the next. GMP+ accepts several methods, provided they are reliable.
Which limits apply?
For coccidiostats and histomonostats, those in Directive 2009/8/EC; for medicated feed, those in Regulation (EU) 2019/4 and its implementing acts; plus any added by GMP+ or the customer.
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Sources
Where each figure comes from
References to the official text in force. If a standard is revised, this page is updated and the review date says so.
- GMP+ Feed Certification scheme, Feed Safety Assurance module (GMP+ B1, B3, B4 and BA documents) GMP+ International · Documents in force
- Directive 2009/8/EC on the unavoidable carry-over of coccidiostats or histomonostats in non-target feed EUR-Lex · 10 February 2009
- Regulation (EU) 2019/4 on the manufacture, placing on the market and use of medicated feed EUR-Lex · 11 December 2018