Best Digestive Enzyme Supplement for Poultry: A Review

Digestive enzymes are among the most cost-effective feed additives available. In my years of formulation work, I’ve seen enzyme combinations save operations 10-15% on feed costs while improving bird performance. But choosing the right enzyme product requires understanding what each enzyme does and when it provides value.

Phytase: The Foundation Enzyme

Phytase is the most widely used feed enzyme in poultry nutrition, and for good reason. It breaks down phytate, the storage form of phosphorus in plant ingredients, releasing phosphorus that would otherwise be unavailable.

The practical impact is significant. A standard phytase inclusion at 500 FTU/kg releases approximately 0.12-0.15% available phosphorus. This allows the formulator to reduce dicalcium phosphate or monocalcium phosphate inclusion by roughly 50%, saving $3-5 per ton of feed.

Beyond phosphorus release, phytase also has a “super-dosing” effect at 1000-1500 FTU/kg. At these higher levels, phytase degrades phytate more completely, reducing the anti-nutritional effects of phytate on protein digestibility and mineral absorption. Super-dosing typically adds 1-2% improvement in amino acid digestibility.

Not all phytase products are the same. Bacterial phytases (E. coli-derived) are generally more heat-stable and active in the bird’s gut than fungal phytases. I recommend bacterial 6-phytases for most commercial applications.

Xylanase: The Energy Releaser

Xylanase breaks down arabinoxylans, the non-starch polysaccharides (NSPs) found in wheat, barley, and to a lesser extent, corn. These NSPs increase gut viscosity, trapping nutrients and reducing digestibility.

In wheat-based diets, xylanase typically releases 80-120 kcal/kg of energy. In corn-based diets, the response is lower but still meaningful at 50-80 kcal/kg. The enzyme effectively makes the energy in the grain more available.

The viscosity-reducing effect has secondary benefits. Lower gut viscosity improves litter quality, reduces sticky droppings, and decreases the incidence of pododermatitis. These are real economic benefits that go beyond the feed formulation savings.

Protease: The Protein Optimizer

Protease enzymes break down proteins into peptides and amino acids. Supplemental protease improves the digestibility of protein sources by 3-6%, reducing the need for expensive ingredients like soybean meal or fish meal.

Protease is most valuable in diets with high levels of alternative protein sources or in young birds with immature digestive systems. In starter feeds, protease consistently shows the largest responses because the bird’s own enzyme production is still developing.

I typically recommend a multi-protease product that contains both endo- and exo-protease activities. Single-enzyme products often have limited substrate range and produce inconsistent results.

Multi-Enzyme Products vs Single Enzymes

The trend in the industry is toward multi-enzyme products that combine phytase, xylanase, and often protease and glucanase. These products simplify inventory management and often show synergistic effects.

However, the formulation matrix values for multi-enzyme products are more complex. Each enzyme component has specific release values, and the combination effects are not always additive. Working with a nutritionist who understands the product’s specific matrix is essential.

In my experience, the best approach is:

• Use phytase universally in all poultry feeds
• Add xylanase in wheat-based or high-fiber diets
• Consider protease in starter feeds or when using alternative protein sources
• Evaluate multi-enzyme products for overall cost savings

Evaluating Enzyme Products

When selecting an enzyme product, I consider:

1. Minimum activity guarantee: The product should state the minimum enzyme activity in units per gram, not just the inclusion rate
2. Heat stability: The enzyme should survive feed conditioning at 80-85°C. Thermostable enzymes are worth the premium
3. Matrix values: The supplier should provide published, research-backed matrix values for energy and nutrient release
4. Trial data: Independent trial results are more reliable than company-generated data
5. Technical support: Good suppliers provide ongoing formulation support

Summary

The best digestive enzyme supplement depends on your specific diet composition and production goals. Phytase should be part of every poultry feed. Xylanase adds significant value in wheat-based diets. Protease helps in starter feeds and when using alternative proteins. Multi-enzyme products simplify logistics but require careful formulation to realize full value. The ROI on enzymes is consistently positive when products are properly matched to the diet.