Nutrient Absorption in Dairy Cows: How Mix Acid Supports Digestive Health and Rumen Balance
Dry cow feed is one of the most decisive parts of the whole production cycle. What a cow eats in the weeks before calving shapes how she starts her lactation, and small gaps in intake or rumen function at this stage often show up as problems after calving.
In this article, we look at why dry cow feeding matters for transition cow nutrition and how Epatox Anion, San Marco’s complementary feed for dry cows, can support dairy cows before calving.
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Table of Contents
- Why dry cow feed matters before calving
- Understanding the dry period and DCAD
- Where Epatox Anion fits in
- Key benefits of Epatox Anion
- How Epatox Anion is used
- FAQ
Why dry cow feed matters before calving
A dry cow is a cow in the period between the end of one lactation and calving, when she is not being milked. It is a recovery phase, but it is also the start of the transition period: the weeks around calving when the cow’s metabolism, rumen and appetite change the most.
This is why dry cow feeding deserves as much attention as the lactation ration. A cow that keeps eating well before calving, with a rumen that works properly, is better prepared for the demands that follow.
Understanding the dry period and DCAD
In the close-up period, intake often tends to fall as calving approaches. When dry matter intake drops, the cow has less of everything she needs, and any problem with the ration becomes more visible after calving.
Many dry cow diets also work on the dietary cation-anion difference (DCAD). Anionic salts are used to bring the ration to a negative DCAD, which acidifies the cow. The practical difficulty is that anion sources are often poorly accepted, so the challenge is to reach the target without hurting intake.
That is why the quality of the anion source matters: it needs to deliver a consistent negative DCAD while staying palatable enough for the cow to keep eating.
Where Epatox Anion fits in
Epatox Anion is a complementary feed for dry cows. It is formulated as a consistent, palatable anion source that delivers the negative DCAD required to consistently acidify cows, while supporting dry matter intake before calving.
Its formula combines mineral sources (monocalcium phosphate, calcium carbonate, magnesium sulphate, magnesium chloride, calcium chloride and magnesium oxide) with yeast autolysate and dried yeasts from Kluyveromyces fragilis, Saccharomyces cerevisiae and Saccharomyces carlsbergensis. The yeast component drives bacterial growth, supporting rumen function and helping optimize metabolizable protein (MP).
It also supplies vitamin A, vitamin E and selenium (as selenomethionine from selenised yeast). With 8.9% calcium, 3.6% phosphorus and 6.3% magnesium, it adds to the mineral profile of the dry cow ration.
The result is a practical solution to support cows through the close-up period, with fewer off-feed issues to diagnose after calving.
Key benefits of Epatox Anion
| Benefit | Impact |
| Support for prepartum dry matter intake | Less time spent diagnosing off-feed issues after calving |
| Consistently formulated, palatable anion source | Supports regular intake of the dry cow ration |
| Support for bacterial growth in the rumen | Supports rumen function and helps optimize metabolizable protein |
| Negative DCAD | Consistently acidifies cows, as required by anionic dry cow diets |
| Magnesium, calcium and phosphorus, plus vitamins A, E and selenium | Contributes to the mineral and antioxidant profile of the dry cow ration |
How Epatox Anion is used
Epatox Anion is a beige powder, packaged in 25 kg bags. Indicative usage: mix with the other components of the complete feed, at a maximum level of 2%, guaranteeing a dosage of 500 g/head/day.
As with all San Marco products, correct use should follow the directions of an expert nutritionist.
FAQ
What is a dry cow?
A dry cow is a dairy cow in the period between the end of lactation and calving, when she is not being milked. It is also the first part of the transition period.
What does Epatox Anion do?
Epatox Anion supports prepartum dry matter intake, supports rumen function and the optimization of metabolizable protein, and delivers the negative DCAD required to consistently acidify cows.
What is DCAD in dry cow feed?
DCAD is the dietary cation-anion difference. In anionic dry cow diets, the goal is a negative DCAD, which is obtained with an anion source such as Epatox Anion.
How is Epatox Anion used?
It is mixed with the other components of the complete feed, at a maximum level of 2%, guaranteeing a dosage of 500 g/head/day.
Can Epatox Anion be used together with other San Marco products?
Yes. It is often used before calving, followed by solutions such as Calciovit, KetoSafe/KetoMax and Glycol Booster, depending on the cow’s specific needs during the transition period.
