IAG – International Analytical Group, Section Feed Analysis

The IAG proficiency test is an international laboratory performance test which is conducted once a year. The ring test includes the following samples: a forage - mostly alfalfa pellets or grass meal pellets (sample S1) and a compound feed - commercial product (sample S2), which are then both analyzed for ingredients, additives and some undesirable substances.

This year a third sample is offered for special parameters. A ground compound feed (sample S3) which is analyzed for MHA, Hg, Cr, Ni, coccidiostats and antioxidants. Some at spiked concentrations.

The aim of the IAG proficiency test is to offer the laboratories the following possibilities:

  • to determine the accuracy of their results,
  • to verify the technical expertise of their staff,
  • to assess the functioning capability of their laboratory equipment.


Please register here by March 10th 2019 latest

If you need more informations please contact office.tifno@Spam@agesno.Spam.at

Participation fee:

€80 per sample plus postage costs (excluding VAT).

For Europe the postage costs are € 10,- for laboratories outside of Europe € 25,-.

Additional material for sample S1 and S2 for internal quality assurance can be purchased (€ 50 per sample, as long as stocks last).

After payment of the fee, samples are distributed in May.

Scope of analysis / methods

Together with the samples, a list of the parameters to be analysed is sent (ingredients, minerals and trace elements, heavy metals, amino acids and, depending on the feed, additives such as vitamins or enzymes. This year an additional ground sample is offered to be analyzed for specific feed additives (MHA, coccidiostats, antioxidants), Cr, Ni and Hg at spiked level.
Those parameters, however, do not all need to be analyzed on an obligatory basis. The analysis methods are not mandatory, but should be indicated to improve the interpretability of the results. (international standard or code) Results obtained by NIRS are evaluated separately. The results are to be expressed as a mean of such a number of replicates, the laboratory normally uses in feed analysis, corrected for dry matter.

Statistical evaluation

The evaluation is anonymous and includes the determination of mean value, median, standard deviation, coefficient of variation and the z-score. The report is submitted electronically. The results are confidential and may not be passed on nor published without the consent of IAG.

Evaluation of results

Each participating laboratory receives a certificate of attendance as well as documentation on their success (number of outliers).

Annual meeting / discussion of results

In the frame of the VDLUFA Congress in the current year (September), all participating laboratories are invited to a ring test meeting discussion in which, in addition to the discussion of results, the arrangement of the next proficiency test is defined.

Timetable 2019

Call for participation: February (deadline for registration: March 10th)
Acquisition of samples: April
Preparation and homogeneity test: April
Delivery of samples: May
Analysis of sensitive analytes: last week in June (June 24th to 28th)
Deadline for submitting results: July 31st
Discussion of results: VDLUFA Congress, September

IAG Downloads

    IAG Statutes (45 K)
    Statutes of the IAG – International Analytical Group, Section Feed Analysis
    download file  | open PDF