Feed Quality and Durability: How to Optimize Your Feeding Program

The healthy growth and high performance of animals are directly linked to the quality of the feed used in their feeding programs. Feed quality is not just about nutritional value; it also includes physical durability, freshness, and shelf life. Durable feeds make the feeding process more efficient and reduce waste.

Feed quality has a direct impact on the health and productivity of animals. High-quality feed improves digestion, strengthens the immune system, and ensures animals benefit fully from nutrients. Low-quality feed can lead to digestive disorders, weakened immunity, and reduced growth.

Feed durability depends on technologies and ingredients used during production. Pellet binders maintain feed integrity and prevent dust formation, reducing feed losses and improving consumption efficiency.

The Pellet Durability Index (PDI) is the standard metric feed mills use to quantify how well pellets survive handling, storage and transport. It is expressed as the percentage of pellets that stay intact after a sample is mechanically agitated. Under the widely referenced ASAE S269.4 tumbling-box method, a 500 g sample of pre-sifted pellets is tumbled for 10 minutes and then re-sifted; the PDI is the weight of intact pellets divided by the original sample weight, expressed as a percentage.

There is no single universal pass mark — durability targets are set by species, diet and how far the feed has to travel — but pellets scoring in the high-90s are generally regarded as durable, while lower scores signal excessive fines, dust and nutrient segregation before the feed reaches the animal. Every percentage point of fines is feed that was paid for but never eaten.

The practical levers that raise PDI include finer grinding of raw materials, correct steam conditioning (moisture and temperature), appropriate die specification (L/D ratio), controlled fat inclusion, and — often the most cost-effective lever — a dedicated pellet binder. A guar-based binder such as GuarBind strengthens inter-particle bonding in the die, lifting PDI, cutting fines and protecting feed conversion (FCR) without diluting the ration's nutritional density.

A dedicated binder raises the Pellet Durability Index reliably, but durable pellets start upstream at the mill. Pellet quality is the product of the whole pelleting line, and it cannot be fixed by changing one setting in isolation. The parameters below are the levers a feed mill controls day to day:

Mash particle size. A uniform, adequately fine grind gives steam and binder more surface area to work on, improving inter-particle bonding. Very coarse particles resist hydration and become fracture points inside the pellet; excessively fine grinding raises energy cost and dust, so mills target a consistent, uniform particle size rather than the finest possible one.

Steam conditioning. Dry, saturated steam that lifts the mash to roughly 80–85 °C gelatinizes native starch, which acts as a natural binder in the die. Under-conditioning — too little moisture, wet steam, or too short a residence time — is one of the most common root causes of soft, crumbling pellets.

Conditioner retention time. Longer retention lets moisture and heat penetrate the mash fully before it reaches the die. Short conditioning leaves the core of each particle dry and weakly bonded.

Die specification (L/D ratio). A higher length-to-diameter ratio increases the compression the mash undergoes, producing a denser, more durable pellet. A worn or too-thin die produces soft pellets even when everything upstream is correct.

Fat placement. Fat added at the mixer lubricates the die and lowers durability; wherever the formula allows, applying fat as a post-pellet coating protects the Pellet Durability Index while still hitting the energy target.

Cooling and handling. Cooling that is too aggressive sets up a moisture gradient that cracks the pellet surface; gentle, complete cooling and minimal drop points preserve the integrity built in the die.

Most pellet durability issues trace back to a small set of causes. Working through them in order is the fastest way to stabilize pellet quality and improve pellet quality batch to batch:

When the process levers are already tuned, a guar-based pellet binder such as GuarBind is the most cost-effective way to lift PDI further, cut fines and hold feed conversion steady. It is one part of a broader feed additives programme that protects feed quality from mill to farm.

Synthetic antioxidants preserve freshness and prevent oxidative deterioration, extending shelf life and maintaining nutritional value. This ensures animals continuously consume high-quality feed and reduces waste.

Fresh feed is essential for performance, especially in hot and humid environments where spoilage occurs quickly. Antioxidant protection stabilizes feed and improves animal resilience.

Improving feed quality requires both physical stabilization and oxidative protection.