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.

• forage, unground - mostly alfalfa pellets or grass meal pellets (sample S1, 700 g),
• compound feed, unground - commercial complete or complementary feed (sample S2, 700 g),
• compound feed, ground – commercial feed for special parameters (e.g. z.B. Hg, Cr, Ni, antioxidants, organic acids, …), partially at spiked level (sample S3, 300 g),
• mineral feed, unground – commercial product (sample S4, 400 g),

Additionally, this year ground vacuumed subsamples (appr. 40 g) of sample 1 and 2 are submitted for the determination of moisture in order to provide a statistical evaluation for this Parameter.

Samples IAG 2021

Sample 1Sample 2Sample 3Sample 4
Alfalfa Complete feed for poultryCompound feed for Special parametersMineral feed for pigs 

Ingredients, digestible protein,


Ingredients,starch, sugar, energy------
Elements and heavy metals, Sulfur, Chloride, Boron Elements and heavy metals, Iodine, FluorideHg (spiked), Ni, Cr
F (spiked)
Elements and heavy metals
---Amino acids, vitamines (A, E, D3),
MHA, Phytase (4a24), Canthaxanthin,
Bac. Subtilis 
Bac. licheniformes, Monensin-sodium
BHT, BHA, Ethoxyquin, 
organic acids
Vitamines (A, E, D3), Phytase (4a24), organic acids


 The aim of the IAG ring 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
• to fullfill the requirments of accreditation bodies to participate in proficiency tests.

The organization of the proficiency test is based on EN ISO 17043.


Please register here by March 19th 2021 at the latest. 

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

Participation fee:

€80 per sample (excluding VAT) plus postage costs (for Europe € 20, for Asia and Australia € 40, for USA € 65, other countries on request.)
Additional material for internal quality assurance can be purchased (€ 50 per sample excl. postage costs), 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, enzymes, MHA, coccidiostats, antioxidants. However, not all parameters need to be analyzed on an obligatory basis. The methods of analysis are freely selectable, but should be specified to improve the interpretability of the results (specification of international standards 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.

Every participant receives a cover letter with all relevant informations and instructions.

Statistical evaluation

The evaluation is anonymous and includes the calculation of mean value, median, standard deviation, coefficient of variation and the z-score according to ISO 13528 by software R. The report is available 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 2021

Call for participation: February (deadline for registration: March 19th)
Acquisition of samples: April 2021
Preparation and homogeneity test: April 2021
Delivery of samples: May 2021
Analysis of sensitive analytes: between June 7th and 11th, 2021
Deadline for submitting results: July 4th, 2021
Discussion of results: Autumn 2021

IAG Downloads

    IAG statute (18.52 K)
    Statute of the IAG for feed analysis
    download file