A well-balanced diet will only produce results if it remains fresh and consistent at the feed fence.
Still, many dairy farmers notice—especially during hot spells—that a TMR heats up more quickly. The feed smells different, cows become more selective at the feed barrier, and feed intake declines. This is often dismissed as a result of hot weather, while the actual cause is usually heat buildup.
Fermentation not only reduces dry matter and nutritional value, but can also lead to lower milk production, reduced rumen stability, and unnecessary feed losses.
What is global warming?
Heat build-up occurs when yeasts and molds become active again as soon as oxygen comes into contact with the feed. During silage removal or after a TMR has been mixed, these microorganisms regain access to oxygen. In the process, they consume sugars and lactic acid, which releases heat.
The result is a ration that gradually heats up and loses its nutritional value. Especially in the summer, this process can happen surprisingly quickly.
Why "broei" is more than just warm food
A reheated feed ration has consequences that aren’t always immediately apparent. Cows are often the first to react. Common signs include:
- lower feed intake;
- more selection at the feed rail;
- less rumination;
- varied manure;
- fluctuations in milk production;
- loss of palatability.
When overheating persists for an extended period, feed costs also rise because valuable nutrients are lost.
Where does global warming occur?
Overheating can occur at various times.
- During silage removal: Once the silo is opened, oxygen comes into contact with the forage. If yeast is present, the temperature can rise rapidly.
- In the TMR: Even a mixed ration does not remain stable indefinitely. Especially on hot days, the temperature can rise within a few hours.
- At the feeding rack: The longer feed remains there, the greater the chance that microorganisms will develop and the palatability will decrease.
Preventing spoilage starts with ensiling
A stable silage pit isn’t just created after it’s opened. The most important decisions are made during the ensiling process. Proper preservation requires:
- adequate compaction;
- a quick, airtight seal;
- proper fermentation;
- control of yeasts and molds.
That is precisely why the top layer deserves special attention. It is the first part to come into contact with oxygen when the silage is opened.
The Role of Organic Acids
Organic acids have been used for many years to support the microbial stability of roughage and TMR. By inhibiting the growth of yeasts and molds, the feed stays fresh and palatable for longer.
This contributes to:
- less heat build-up;
- preservation of nutritional value;
- more consistent feed intake;
- fewer food scraps;
- a more consistent ration.
Ultimately, a consistent diet also supports rumen health and milk production.
Which solution is best for which situation?
Depending on when the loss of quality occurs, Jodoco offers various solutions.
| Product | Application |
|---|---|
| Ruval Plus | Combines a high-protein composition with preservative properties. Supports the cow’s nutrition and helps keep the TMR palatable and stable for longer. |
| Ruval Max | Provides both protein and extra energy while also helping to preserve the mixed ration. |
| Acibet® TMR | Inhibits spoilage in TMR and roughage, helping the ration stay fresh longer and supporting feed intake. |
| Acibet® G | Supports better intake and utilization of the diet and contributes to stable feed quality. |
| Jodosil NC |
Specially developed to improve silage stability. Applicable to:
|
Conclusion
Heat build-up doesn’t happen overnight. It is usually the result of oxygen, insufficient silage stability, and rapid growth of yeasts and molds.
By focusing on preservation during ensiling and opting for a stable TMR during feeding, feed quality, palatability, and feed intake are better maintained.
With solutions such as Jodosil NC, Acibet® TMR, Acibet® G, Ruval Plus, and Ruval Max, Jodoco helps dairy farmers minimize heat stress and maintain a high-quality diet.
Would you like to know which approach is best suited to your business? Contact the specialists at Jodoco for advice on silage stability, feed management, and preservation.
