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Method-Compliant Automatic Fibre Extraction for Feed Analysis

| Editor: Dr. Ilka Ottleben

Figure 1: Fibrebag technology for determining raw fibre, ADF and NDF content of feeds.
Figure 1: Fibrebag technology for determining raw fibre, ADF and NDF content of feeds. (Source: C. Gerhardt)

Fibre determination is in particular important for the analysis of animal feed. Therefore it reproduces the steps of the digestive process in an animal’s stomach. A new method makes dissolving and filtering the components significantly easier and ensures more reliable, reproducible analysis results.

The usability of animal feed and its impact on animal health depend in large part on the proportions of the different fibre fractions that it contains. In the field of biogas production, the fibre fractions of substrates in fermenters are determined in order to distinguish the carbohydrates contained therein and to control the fermentation process accordingly.

The extensive fibre analysis reproduces the various steps of the digestive process in an animal’s stomach. The feed samples are treated with different detergents. The samples are boiled in detergent and washed (except for ADL) and then rinsed and filtered multiple times.

The undissolved residue is dried, weighed and then incinerated. The loss in mass during incineration corresponds to the crude fibre, ADF, NDF or ADL content in the sample.

Makes dissolving and filtering significantly easier

The Fibrebag method developed by C. Gerhardt makes dissolving and filtering the components significantly easier and ensures more reliable, reproducible analysis results compared to the classic filter method using frits and filter beds. The high-precision textile and the large surface area of the filtration bags provide ideal digestion and filtration conditions.

The fully automated Fibretherm unit is based on the Fibrebag method. The system performs the boiling, washing, rinsing and filtration processes for the determination of crude fibre, ADF, ADFom, NDF, NDFom and aNDFom in a self-contained system for twelve samples at a time, using pre-programmed methods.

Reduces working time and consumption of chemicals

Fibretherm considerably reduces the working time per analysis and the consumption of chemicals — while taking up minimal space in the lab. The analysis is method-compliant with the standard Weende feed analysis method and with van Soest detergent method.

The Fibrebag method and automatic fibre extraction with Fibretherm have been adopted by official inspection bodies and by many other VDLUFA members in Germany into their laboratory routines. Regular involvement in national and international ring tests from VDLUFA, GAFTA and Fapas are proof of the method’s excellent analysis quality.

Extensive accessories portfolio available

Accessories such as a dosing pump for automatic amylase feed during NDF extraction, incinerating module for convenient, error-free transfer of samples or a degreasing module for convenient, time-saving degreasing of six samples at a time are also available.

* Contact: C. Gerhardt GmbH & Co. KG, 53639 Königswinter/Germany

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