+49 2581 94102-0 info@gites-gmbh.de

Recent studies show that WH67® humic acids have a significantly better effect than unprocessed humic substances


Humic acids gain increased importance in livestock feeding. However, these substances are extremely diverse, which is why a targeted selection and treatment is required prior to their developement of the intended effects.

In 2017, two studies were carried out using the same methodology for testing the efficiency of humic acids in piglet rearing. The main difference of the studies conducted, consisted of the used products. LÜTKE-DÖRHOFF et al. (2017) made a trial with humic acids of the type WH67® EG02. The producers of this type of humic acid look back on 50 years of experinece and therefore produce WH67® according to a special process and are characterized by a high degree of standardization. In another trial, which was carried out by a private research institute, an unprocessed Leonardite was used. Leonardite is a raw material that can contain humic substances. However, this is often not processed or standardized and therefore resulting in great variations in quality.

The results of the two experiments are shown below.


Tab 1: Results of the piglet rearing when using WH67® EG02 (LÜTKE-DÖRHOFF et al. 2017)

Tab 2: Results of the piglet rearing when using unprocessed Leonardite (study conducted by a private research institute)

Change of daily weight gain in gramm

Illustration 1: Change of daily weight gain in gramm

Discussion & Conclusion

  • The use of WH67® EG02 shows a significantly better effect compared to the addition of unprocessed Leonardite. When using WH67® EG02, the daily gain has increased by 4.7 % while the feed intake increased by 9 %.
  • Supplementation with unprocessed Leonardite resulted in a reduction of the daily gain by 3,2 % and the feed intake declined by 3,0 %.

Even though the dosage (4-6 kg/to) of the unprocessed Leonardite has been twice as high compared to the WH67® EG02 (2-3 kg/to) in the piglet feeding, the performance of the piglets differ significantly. While the use of the WH67® EG02 resulted in an increase in performance, the usage of the unprocessed Leonardite lead to a significant reduce in piglet performance.

This experiment impressively shows that only those humic acids have positiv effects in piglet rearing, which have been selected and processed by a special process.

Writer: Matthias Tuente, R&D Department GITES GmbH


LÜTKE-DÖRHOFF, M., WESTENDARP, H., HAUFE, S., REEKEN, J.B. (2017): Einfluss von Huminsäuren auf die Aufzuchtleistung und Gesundheit von Ferkeln. 17. Boku-Symposium Tierernährung, 12. April 2018, Wien.

Excerpt from a research paper, study conducted by a private research institute.

We are glad to answer your questions!

Phone: +49 2581 94102-0
Telephone consultation, weekdays 8:00am – 5:00pm

Our 24/7 contact