BLOGS > ENERGY UTILIZATION IN LOW ENERGY DIETS

The challenge

Why fat digestibility is your most important control variable

In poultry nutrition, efficient fat digestion is the difference between a high-performing flock and wasted feed costs. Fat is the most expensive energy source in a poultry ration. However, young birds, especially broiler chicks, struggle to process dietary fats efficiently.

The problem

Young chicks have an immature digestive system with low bile secretion. Their natural bile salt production simply cannot keep up with modern high-energy formulations, leaving 20-30% of dietary fat undigested and wasted.

The science of fat absorption

How fats are utilized: a three-phase process

For dietary fat to be utilized, it must pass through three physiological steps:

1. Emulsification
   Large fat globules are broken into smaller droplets, increasing the surface area available for enzymatic action.
2. Hydrolysis
   Lipase enzymes split triglycerides into monoglycerides and free fatty acids, molecules the intestine can actually absorb.
3. Micelle formation
   These digestion products are incorporated into micelles that transport lipids across the intestinal wall into the bloodstream.

When emulsification is suboptimal, the entire downstream process becomes less efficient, especially in young birds and piglets or in diets rich in saturated fats. Birds produce natural bile salts for emulsification, but young chicks’ immature systems create a bottleneck. Standard micelle formation cannot bridge this gap because it lacks the chemical structure for efficient micelle formation in the aqueous (water-based) environment of the chick’s gut.

Not all lysolecithins are the same

While many products are marketed under the broad umbrella of “lysolecithins,” their efficacy in a broiler’s gut depends heavily on their chemical “fingerprint.”

The quality and performance of a lysolecithin product are generally dictated by three main factors: the degree of conversion, the phospholipid profile, and the carrier system

1. The Degree of Hydrolysis: Standard lecithin is a mixture of phospholipids (PC, PE, PI). To create lysolecithin, an enzyme (phospholipase A2) snips off one fatty acid chain.
   • Partial Hydrolysis: If the conversion is low, the product behaves more like standard lecithin—good for food texture, but weak for fat digestion in a bird.
   • High Hydrolysis: A high conversion rate creates a higher concentration of lysophospholipids, which are significantly more “water-loving” (hydrophilic) and effective at forming the small micelles needed for absorption.
2. The HLB Value (Hydrophilic-Lipophilic Balance): This is the “gold standard” for measuring emulsifier strength.
   
3. The Phospholipid Profile
   Not all “Lyso” molecules are equal. The specific ratio of the following determines the biological activity:
   • Lyso-Phosphatidylcholine (LPC): The “heavy hitter” for improving membrane permeability and nutrient absorption.
   • Lyso-Phosphatidylethanolamine (LPE): Excellent for helping stabilize the emulsion.
   • Lyso-Phosphatidylinositol (LPI): Often plays a role in cell signaling within the gut wall.

Crucial Difference: Some lower-grade products are simply “modified lecithins” or blends with high amounts of carrier oil. High-tier lysolecithins maximize the LPC content, which is the most expensive but most effective component for poultry growth.

Why Olus®Digest is different

The lysolecithin advantage

While birds produce natural bile salts for emulsification, young chicks often have an immature digestive system with low bile secretion. Olus®Digest differs from standard soy lecithin because it has undergone enzymatic hydrolysis (removing one fatty acid chain).

Key technical benefits

• Higher HLB Value: Olus®Digest has a higher Hydrophilic-Lipophilic Balance (HLB) than standard lecithin. This makes it much more effective at stabilizing oil-in-water emulsions in the gut.
• Smaller Micelles: It facilitates the formation of smaller, more stable micelles, which speeds up the absorption of fat-soluble vitamins (A, D, E, K) and pigments.
• Membrane Permeability: Beyond emulsification, Olus®Digest can modify the fluidity of the intestinal cell membranes, making it easier for nutrients to pass through.

Impact on poultry performance

Practical application

Olus®Digest is most effective in:

• Starter Diets: Where bile salt production is the limiting factor.
• High-Density Diets: For broilers requiring rapid growth.
• Saturated Fat Diets: When using vegetable acid oils or animal fats that are naturally harder to emulsify.

Efficient fat digestion is not guaranteed by fat inclusion alone. It depends on the animal’s physiological capacity, diet composition, and the effectiveness of the emulsification process in the gut. Well-characterized lysophospholipids can support this process. Olus®Digest is developed to help nutritionists improve fat utilization consistency under modern commercial conditions.

About the author

Muhammad Suleman – Regional Manager | Southeast Asia and Middle East 

Muhammad Suleman, Regional Manager for Southeast Asia and the Middle East, joined the Olus team in 2023. His involvement with Olus brings a wealth of experience and a deep passion for the poultry industry. With years of experience and extensive knowledge of the complexities of poultry farming, Muhammad has a deep understanding of the market. Within Olus, he is actively involved in developing new feed additives and exploring nutritional strategies to improve gut health and performance in a sustainable way.

Reach out to Muhammad today for personalized guidance.