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conditioning impact
How does proper conditioning impact feed pellet quality and durability?
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5 Replies
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Proper conditioning of feed significantly improves pellet quality and durability by enhancing starch gelatinization, promoting better binding between feed particles, and increasing the feed’s overall resistance to breakage. This results in reduced fines, improved nutrient availability, and increased efficiency in feed processing and animal digestion.
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detailed information
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HOW DOES CONDITIONING IMPACT PELLET QUALITY AND DURABILITY?
The following is provided “as is,” and should be considered as general information; however, you should always seek professional advice, specific to your individual circumstances.
Increased Pellet Durability Index (PDI) and Hardness– higher conditioning temperatures and conditioning times improve the moisture and heat penetration into feed particles. This leads to better starch gelatinization and protein denaturation, which enhance adhesion among feed components, resulting in pellets that are harder and more durable.
However, actual gelatinization levels during typical steam conditioning are relatively low, often around 15–20%, meaning only a partial loss of the crystalline structure of starch granules occurs. Complete gelatinization, where starch fully loses its crystalline form, generally requires more intense heat and moisture conditions than those used in commercial feed conditioning.
What primarily happens during conditioning is the leaching of amylose molecules from the starch granules rather than full gelatinization. This amylose leaching facilitates interactions between starch and protein molecules, which helps form a stronger matrix within the pellet, and as a result more durable pellets.
Feeds with higher protein content tend to produce pellets with greater durability because of the increased availability of protein to form these binding networks.
Research indicates that the majority of starch gelatinization happens not during conditioning but as the feed passes through the pelleting die, where mechanical shear and higher localized temperatures cause more extensive starch disruption.
According to Nils Lastein, Application Manager – Feed, Andritz, conditioning times longer than 45 seconds have only a limited effect on pelleting performance in most formulas. However, longer conditioning times may still be relevant to meet the requirements for feed sanitation or liquid absorption.
Retention time in the conditioner needs to be sufficient to ensure that heat and moisture has completely been absorbed by the mash particles up to the core. No particles with wet slippery surface and no lumps. Finer particle sizes increase the surface area available for steam absorption, which enhances moisture uptake and heat transfer. This leads to more effective conditioning, as smaller particles can absorb steam more readily than larger ones. As a result, feeds with smaller particle sizes typically require shorter retention times to achieve optimal moisture content and temperature.
Pathogen reduction – with the move in many countries to ban antibiotic growth promoters, and reduce the use of antibiotics, hygienization of feed (typically achieved through heat treatment with longer retention times) to help to eliminate pathogens and molds is becoming increasingly important. This includes making sanitized mash feeds, without subsequent pelleting.
Breeder feeds often undergo longer conditioning times compared to commercial animals effectively sanitizing the feed. This extended heat exposure is critical because breeders have a longer production cycle and are more vulnerable to persistent infections, so feed hygienization must be more rigorous than for commercial animals.
Conditioning Temperature – conditioning time interacts closely with temperature. For example, at higher temperatures, shorter conditioning times may be sufficient to achieve good pellet durability and animal performance, while at lower temperatures, longer times are needed for similar results.
Trade-offs- longer conditioning times improve pellet durability and starch gelatinization but can reduce nutrient digestibility and growth performance if excessive, especially at very high temperatures. Thus, a balance must be struck between pellet quality and nutritional value.
Conditioner Design – the length and design of the conditioner, influence how quickly and evenly heat and moisture are transferred, affecting the necessary conditioning time.
Steam Quality – dry steam transfers heat more efficiently, the feed reaches optimal conditioning parameters faster, improving pellet durability and hardness without unnecessarily prolonging retention time.
Conversely, poor steam quality (wet steam with water droplets) lowers conditioning efficiency. Water droplets do not transfer heat as effectively and can cause uneven heating and moisture distribution. This leads to poor starch gelatinization, lower pellet quality, increased fines, and may require longer conditioning times to compensate.
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thanks very much,sustaining this will go a long way and record keeping will let trace any fault along the line
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Proper conditioning significantly improves feed pellet quality and durability by using steam and heat to alter the physical and chemical properties of the feed ingredients.
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