Liquid feed hygiene & acids

The key to healthy and high-performing pigs: Liquid feed hygiene & acids

12/12/2025Pigs > Expertise
Hygiene is crucial for good feed quality and optimal animal health. Discover here how to achieve this and prevent molds and bacteria from multiplying rapidly!

Thanks to the high moisture content and the rich supply of nutrients such as sugar and starch, wet by-products and liquid feed mixtures provide a favorable environment for microbial activity, which requires extra attention. Without careful hygiene management, unwanted microorganisms such as molds, yeasts, and enterococci can multiply rapidly, with negative consequences for feed quality and animal health.

⚠️ Dangers of poor liquid feed hygiene

  • Loss of dry matter → lower feed conversion

  • Breakdown of proteins and energy → reduced feed value

  • Unpleasant odor or taste → poorer feed intake

  • Increased risk of pathogens → mortality, health issues

🧪 Organic acids: proven protection

Organic acids are an efficient solution for preserving liquid feed and improving hygiene. A synergistic blend works on different levels:

  • Inhibits the growth of molds, yeasts, and bacteria → consistent feed quality

  • Stabilizes pH → prevents spoilage

  • Supports gut health

  • Improves palatability

  • Extends shelf life

🔧 Practical application

Good hygiene starts with the intake and storage of by-products. If these are not optimal, organic acids can effectively suppress the growth of unwanted microorganisms, keeping products fresh longer and preserving their nutritional value.

The feed installation also deserves attention: applying acids helps keep tanks and pipes clean, which is crucial for reliable feed quality.

📊 Effectiveness of acids

Acids lower the pH and are also active against unwanted microorganisms, with each acid working slightly differently. Most acids sold on the market are blends of the following active components:

Acid component
Active against mold
Active against yeasts
Active against G-
Active against G+
Formic acid
+
++
+++
+
Propionic acid
++
+
++
+
Sorbic acid
+++
++
+++
++
Benzoic acid
+
++
+++
+
Acetic acid
0
0
+++
+
Sodium formate
+
++
+++
+

With Selko products from Trouw Nutrition, we offer proven, solution-oriented synergistic acid blends to extend shelf life and maintain nutritional values in by-products, liquid end mixtures, as well as cleaning the feed system.

By-products & circuit
By-products & circuit
Active against biofilm
Active against enterococci cf. Salmonella
Acid concentration in synergistic blend
RSD
RBD
BE+
fysal
Formic acid
+++++
++++
++++
+++
Propionic acid
++
+++
+++
+++
Sorbic acid
+
0
+
0
Benzoic acid
0
+
+
0
Acetic acid
0
0
+
++
Sodium formate
0
0
++
+++

Standard recommended dosage for by-products: 1.5 – 3 kg/ton

Standard recommended dosage for feed systems: 3 – 5 kg/ton

Do you have questions about acids and their practical application in your by-products or feed system? Our specialists are ready to provide company-specific advice. Feel free to contact us.