Animal Feed Testing - The Weende Analysis Package

Origin and application.

The Weende analysis was developed in 1865 at the Landwirtschaftliches Untersuchungsamt in Weende (Germany) by Wilhelm Henneberg and Friedrich Stohmann. This standardised method forms the global basis for determining the basic nutritional values of animal feeds.

Importance of accreditation and standardisation

TLR performs Weende analyses in accordance with ISO 17025 (RvA L059). Depending on the analytical matrix (animal feed), the determinations are accredited. This approach provides assurance in four critical areas:

  • Regulatory compliance
    Regulation (EC) No. 767/2009 requires that feed materials and compound feeds state the minimum and maximum content of, among other things, crude protein, crude fibre and crude ash on the label.
  • Quality assurance
    Validated analytical methods and standardised procedures within the Certus Logic Protocol ensure traceable, reproducible measurement results.
  • Trade certainty
    Results from accredited laboratories are recognised for contract deliveries, export certification, audits and claims.
  • Nutritional optimisation
    Accurate analyses make it possible to formulate feeds based on measured data rather than estimates.

Composition of the Weende analysis package

The Weende package consists of six standardised parameters that together provide a fundamental understanding of the chemical composition of animal feeds:

Parameter

Method and content

Moisture content

Drying at 103 °C to constant weight

Crude protein (CP)

Nitrogen determination (Kjeldahl or Dumas), multiplied by factor 6.25

Crude fat (EE)

Soxhlet extraction with petroleum ether

Crude fibre (CF)

Residue after treatment with diluted acids and bases

Crude ash

Ashing at 550 °C, representing inorganic content

Nitrogen-free extracts

Difference between dry matter and the sum of the above fractions; mainly sugars and starch

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