Rethinking Nutrient Efficiency in Dairy Nutrition with Omni-Bos™ PHY

The dairy ration you’ve carefully formulated might be unexpectedly leaving nutrients locked away in a form the cow can’t access.

That hidden gap between nutrients present and nutrients available matters as you work to maintain herd performance while managing feed costs and environmental outcomes. Input prices fluctuate, margins tighten and ration formulation becomes increasingly complex. Variability in the cost of cereals, protein meals, rumen-protected nutrients and mineral sources adds uncertainty and limits flexibility.

These pressures are driving interest in strategies that maximize the value of nutrients already present in the ration while reducing reliance on expensive supplementation. Addressing phytate—an easy-to-overlook barrier to nutrient utilization—is one such opportunity.

Modern Dairy Nutrition: High Performance, Overlooked Trade-Offs

Over recent decades, improvements in genetics and management have contributed to consistent increases in dairy cow productivity. As production has increased, cows have increased their feed intake to meet greater nutrient demands.

That higher intake is essential to sustain performance, but it brings a trade-off: a faster rumen passage rate. As feed moves more rapidly through the rumen, less time is available for microbial fermentation. This limits the extent to which feed components can be broken down, meaning some nutrients may remain only partially digested.

Common Feeding Strategies: Implications for Nutrient Digestibility and Utilization

Two common formulation strategies help meet the rising nutritional demands associated with higher production:

• More concentrates: Rations increasingly rely on higher concentrate-to-forage ratios to deliver sufficient energy and protein density. This shift supports production but also increases the proportion of compound feed ingredients while reducing the contribution of roughage. As a result, nutrient availability becomes more dependent on effective digestion of concentrate-based ingredients.
• Rumen protection: To ensure that key nutrients bypass rumen degradation and are absorbed in the small intestine, rumen-protected ingredients and amino acids are more frequently included. This targeted post-ruminal delivery supports performance but, in the case of rumen-protected protein meals, also reduces interactions between other feed components and rumen microbes.

These strategies are essential for sustaining productivity, but they also interact with the effects of higher feed intake. Combined with a faster passage rate, they further reduce the time and extent of microbial fermentation, creating conditions in which nutrient digestion in the rumen is less complete.

Phytate: The Hidden Nutrient Trap in Dairy Rations

Phytate is an often-overlooked contributor to nutrient-use inefficiency. It is the primary storage form of phosphorus in plant-based feeds, particularly grains and oilseed meals.

Between 60% and 80% of the total phosphorus in cereal grains and common protein meals, including soybean, rapeseed (canola) and sunflower meals, is present as phytate.¹˒²˒³ Forages and other roughages contain negligible amounts of phytate.¹˒²˒³

The result is that today’s concentrate-rich diets introduce substantial phytate into dairy rations.

Feed Ingredient	Total P (g kg-1)	Phytate P (g kg-1)	Phytate P / Total P
Corn	2.7	1.8	~66%
Barley	3.5	2.3	~66%
Sorghum	2.9	2.0	~69%
Oats	3.3	2.1	~64%
Wheat	3.1	2.0	~65%
Soybean meal	6.5	4.2	~65%
Rapeseed meal	9.3	6.5	~70%
Cottonseed meal	10.5	7.9	~75%
Sunflower meal	10.8	8.6	~80%
Linseed meal	8.8	6.2	~70%
Wheat bran	12.0	10.2	~85%

The phytate content of feed ingredients is not uniform. It varies with plant species, variety, growing conditions and processing methods. Oilseed meals and cereal grains differ in their total phytate content and in the proportion of phosphorus stored as phytate. Processing steps such as heat or chemical treatment, grinding and fermentation can also influence the accessibility of phytate and its interactions with other nutrients.

This variability makes it more difficult to predict the phytate load in dairy rations and highlights the importance of strategies that consistently address its nutritional effects.

Phytate also has well-established antinutritional effects. In monogastric animals, such as poultry and swine, phytate is a notorious cause of nutrient-use inefficiency. This is because its strong negative charge allows it to bind to positively charged proteins, amino acids and minerals such as calcium and trace elements. This results in a reduction of their availability for digestion and absorption.⁵

Ruminants have the inherent capacity to degrade phytate through phytase activity supplied by rumen microbes, but the process is neither complete nor consistent under modern feeding conditions in dairy cows.

Early research in dairy cows suggested that rumen microbes could degrade 95% or more of phytate.⁷ However, more recent studies reveal a different picture.^1,7 Rumen phytate breakdown is highly variable and often incomplete, with reported values ranging from approximately 48% to 91% .¹ This means that a significant fraction of phytate can escape the rumen intact. Subsequently, in the acidic environment of the abomasum, the undegraded phytate can subsequently rebind with nutrients, further reducing their availability for digestion and absorption.

Since cows produce no endogenous phytase in the small intestine, any phytate that bypasses the rumen remains largely undegraded. Phytate-bound, protein, amino acids minerals then pass through the cow underutilized and are excreted in manure.

Even a nutritionally balanced ration can leave some phosphorus and phytate-bound nutrients locked away in a form the cow can’t access. To compensate, you might over supplement phosphorus or protein or pay a premium for highly digestible ingredients such as rumen-protected protein, raising costs and increasing nutrient excretion. Directly addressing phytate offers an opportunity to improve nutrient efficiency in ways that benefit both profitability and sustainability.

Omni-Bos™ PHY: Breaking the Phytate Lock in Dairy Nutrition

Omni-Bos™ PHY is a phytase developed specifically for ruminants, with the objective of improving the utilization of nutrients bound to phytate, particularly protein and minerals. This ruminant phytase supports phytate breakdown beyond what is achieved through natural rumen fermentation, helping make these nutrients more available to the animal.

This additional release of nutrients can improve overall nutrient utilization, helping cows derive more value from the same ration. Better utilization also reduces nutrient losses through excretion, improving efficiency at both the feeding and system levels.

Research in lactating dairy cows supports this concept, demonstrating significant improvements in nutrient digestibility when phytase is included in diets that reflect modern feeding conditions.⁷˒⁸

Improved nutrient digestibility can give you greater flexibility in ration formulation. More efficient use of protein fractions may reduce reliance on higher-cost inputs while supporting balanced nutrition within increasingly complex feeding systems.

This approach represents an important shift in dairy nutrition. Nutrient efficiency can be improved not only by formulating diets more precisely but also by increasing the availability of nutrients already present in the feed that are trapped by phytate.

Where Performance Meets Sustainability

Improving nutrient efficiency is both an economic and environmental priority. When cows use nitrogen and phosphorus more efficiently, less is excreted in manure, reducing environmental impact. As regulatory pressure on nutrient losses and emissions increases, strategies that reduce excretion become increasingly important.

By unlocking phytate bound nutrients, Omni-Bos™ PHY helps align high-performance nutrition with sustainability goals. Studies have shown reductions in phosphorus and nitrogen excretion.⁷˒⁸ This means lower emissions from manure and associated with this, less nutrient accumulation in soils and reduced leaching risk —ultimately decreasing the environmental footprint per unit of milk.

Omni-Bos™ PHY: A New Perspective in Nutrient Efficiency

Modern dairy nutrition has achieved remarkable productivity gains but has resulted in new inefficiencies associated with dietary phytate. Omni-Bos™ PHY is a science-driven phytase solution that helps cows extract more value from nutrients already present in feed. This improved nutrient utilization can help reduce feed costs and nutrient excretion.

Rethinking nutrient utilization means looking beyond precise formulation to consider the availability of nutrients within the ration. By making more of the ration’s nutritional value available to the cow, Omni-Bos™ PHY helps unlock greater profitability, performance and sustainability on dairy farms.

References

1. Haese, E., Krieg, J., Grubješić, G., Feyder, A., and Rodehutscord, M. (2020). Determination of in situ ruminal degradation of phytate phosphorus from single and compound feeds in dairy cows using chemical analysis and near-infrared spectroscopy. Animal, 14(7), 1461–1471.
2. National Research Council. (2001). Nutrient Requirements of Dairy Cattle (7th rev. ed.). Washington, DC: National Academy Press.
3. Viveros, A., Centeno, C., Brenes, A., Canales, R., and Lozano, A. (2000). Phytase and acid phosphatase activities in plant feedstuffs. Journal of Agricultural and Food Chemistry, 48(9), 4009–4013.
4. IFF Animal Nutrition & Health. Internal data.
5. Humer, E., and Zebeli, Q. (2015). Phytate in feed ingredients and potentials for improving the utilization of phosphorus in ruminant nutrition. Animal Feed Science and Technology, 209, 1–15.
6. Park, W.-Y., Matsui, T., Konishi, C., Kim, S.-W., Yano, F., and Yano, H. (1999). Formaldehyde treatment suppresses ruminal degradation of phytate in soyabean meal and rapeseed meal. British Journal of Nutrition, 81(6), 467–471.
7. Dersjant-Li, Y., Kok, I., Westreicher-Kristen, E., García-González, R., Mereu, A., Christensen, T., and Marchal, L. (2023). Effect of a biosynthetic bacterial 6-phytase on the digestibility of phosphorus and phytate in midlactating dairy cows. Journal of Animal Science, 101, skad032.
8. García-González, R., Ped, S., Dusel, G., Koch, C., Christensen, T., Marchal, L., and Dersjant-Li, Y. (2025). Effects of a novel bacterial 6-phytase on nutrient digestibility in lactating dairy cows. Journal of Dairy Science, 108(4), 3702–3711.