Butyrate: A problem or a solution on dairy farms?

Spoiler alert: It depends on the context

You may have read articles warning about the dangers of butyric acid (butyrate) in silage. At the same time, nutritionists talk about butyrate as a valuable feed additive, especially for dry cows in the close-up phase. So which is it? Is butyrate harmful or helpful?

The truth is: both are correct, depending on the source and the situation. Let’s break it down.

Butyrate in poorly preserved silage: a risk

When silage is not packed tightly or sealed properly, Clostridium bacteria can grow. These bacteria produce high levels of butyric acid during fermentation.

This causes three main problems:

1. Bad smell and taste
   Cows may reject the silage because of the strong odor and bitter taste.
2. Lower feed intake and poor rumen function
   Uncontrolled levels of butyrate can upset rumen fermentation.
3. Health issues and milk drop
   Toxins from Clostridium (like C. perfringens or C. botulinum) can lead to diarrhea, inflammation, and lower milk production.

The high levels of butyrate are a warning sign, not the problem itself.

The real issue is the uncontrolled growth of anaerobic bacteria during poor silage fermentation. These microbes, especially Clostridium species,  produce butyric acid as a by-product of unwanted microbial fermentation.

Functional butyrate in feed: a valuable tool to reset the rumen

On the other hand, when butyrate is added in a controlled and targeted way, it becomes a powerful ally in dairy nutrition, especially in close-up cows.

Here’s what functional butyrate can do for cows:

1. Stimulates rumen development during the transition to lactation
   Butyrate promotes the growth and elongation of rumen papillae, increasing surface area for nutrient absorption. This gives the rumen the best possible start for lactation.
2. Support gut health
   Butyrate feeds the cells in the gut lining, improving digestion, nutrient absorption and decreases leaky gut syndrome.
3. Boost the immune system
   A healthy gut leads to stronger immunity and better resilience.

Key takeaways

Watch out for high butyrate in silage. It signals a conservation issue, not a feed benefit. But don’t confuse it with functional butyrate additives, which are scientifically designed to support cow health and performance. Both messages are true, but are totally different in cause and effect!

Learn more about magnesium butyrate: a valuable tool to reset the rumen of dry cows in the close-up phase >>