By Lesley WJ Nernberg, Lighthouse Agri-Solutions and Matthew Clark, FeedGuys Resources

Soybean meal is the benchmark plant-protein ingredient in animal feeds, but its true value extends beyond crude protein. For poultry and livestock producers, the nutrients that matter are the usable energy and digestible amino acids delivered consistently to the animal. That value chain begins before soybeans reach the crush plant: harvest moisture, field and artificial drying, storage and handling conditions can affect bean quality and the feeding value of the resulting meal. For northern U.S. growers, processors, soybean buyers and feed manufacturers, this creates an important opportunity – where cooler, drier harvest conditions common across northern production areas can help preserve soybean quality and reduce the risk of excessive pre-processing heat exposure.  

The quality journey begins at harvest  
Soybeans must be dried to safe storage moisture levels to prevent mold, spoilage and heating. However, high initial moisture, excessive drying temperatures, prolonged exposure to heated air, uneven drying or poor cooling and storage can add thermal stress before the beans ever reach a crush plant. Heat exposure may also occur later during transport, processing or feed pelleting, making quality preservation a responsibility across the entire supply chain.  

Northern U.S. production offers a potential advantage because soybeans are often harvested under cooler, relatively dry autumn conditions that can support natural field dry-down and reduce reliance on aggressive artificial drying. This does not guarantee superior quality in every crop year or shipment, as management remains critical. Nevertheless, careful harvest timing, moisture control, drying, cooling, storage and transport can help preserve bean condition and protect the nutritional value ultimately delivered in soybean meal.  

When heat becomes a nutritional issue
Heat is essential in soybean processing because it reduces trypsin inhibitors and other anti-nutritional factors, helping produce safe, highly digestible soybean meal. The risk arises when total heat exposure becomes excessive. Soybeans may already have experienced high-temperature drying or storage heating before reaching the crush plant, leaving processors less flexibility to apply the heat required for proper processing without risk of over-processing.  

Excess heat, particularly in the presence of moisture, can promote the Maillard reaction between proteins and reducing sugars. Lysine is especially vulnerable. Although a soybean meal may show an acceptable crude protein and total lysine value via laboratory analysis, some lysine may not be biologically available to the animal. This can reduce amino acid availability and increase the need for supplemental amino acids or higher soybean meal inclusion to meet diet specifications.  

For feed manufacturers and nutritionists, the practical focus should therefore be on digestible amino acids – not crude protein and total amino acids alone. Managing heat exposure from harvest and drying through storage and processing helps protect usable amino acids, maintain nutrient consistency, and preserve the feeding value of the finished soybean meal.   

From heat damage to animal performance
Pre-processing heat damage can affect more than laboratory values. When excessive heat reduces amino acid availability – particularly available lysine – it can weaken amino acid balance, reduce protein utilization and potentially affect feed intake. The consequence is lower daily nutrient intake, even when the diet appears to meet its specification on paper. This is especially important in poultry nutrition, where feed intake directly influences average daily gain, feed efficiency, carcass yield and margin per bird.   

Research and practical feed industry experience show that excessive heat treatment can reduce amino acid digestibility and protein efficiency, contributing to reduced bird performance. A soybean meal that consistently provides digestible amino acids and usable energy supports more reliable feed intake and daily nutrient supply – helping birds achieve their intended growth and production potential.   

What the recent data shows
Physical bean condition is a useful place to start when assessing soybean quality. Greying or browning of beans can be a visible warning sign of heat exposure from field conditions, drying or storage. Quality deficits in the incoming bean cannot be fully corrected by later processing.  

As presented in previous newsletter, recent comparative soybean data from the USSEC Quality Report (June 2026) showed lower measured heat damage in U.S. soybeans than in the Brazil and Argentina/Uruguay samples evaluated. The U.S sample averaged 0.02% heat damage, compared with 0.34% for Brazil and 0.68% for Argentine/Uruguay. The same dataset reported average bean moisture of 10.91% for the U.S. samples, compared with 12.16% for Brazil and 12.82% for Argentina/Uruguay.  

The value of protecting soybean quality by origin is reflected in broiler nutrient data. In a study by Aguirre et al. (2024) and presented below, U.S. soybean meal provided the highest average AME and AMEn values and showed the least variation in AMEn among the soybean meal origins evaluated.  

Broiler energy value of soybean meal by origin

Origin	AME (kcal/kg)	AMEn (kcal/kg)	AMEn Coefficient of Variation (%)
USA	2500	2334	5.68
Argentina	2444	2282	7.78
Brazil	2444	2277	6.60

For feed manufacturers, both nutrient density and consistency have commercial importance. The U.S. soybean meal samples supplied 52 kcal/kg more AMEn than Argentine meal and 57 kcal/kg more than Brazilian meal. In addition, the lower variation in U.S. samples provides nutritionists with greater confidence that the formulated energy matrix will be delivered consistently across shipments.   

A better way to evaluate soybean value
For soybean growers, the message is that harvest and post-harvest management are part of the soybean’s nutritional story. Timely harvest, careful moisture management, controlled drying where required, proper cooling and sound storage practices help preserve the value created in the field.   

For buyers and feed manufacturers, the purchasing decision should go beyond price per ton and crude protein percentage. A complete evaluation should include:  

• Bean moisture, physical condition, damaged kernels and evidence of heat exposure 

• Crude protein, fat, fiber and energy value 

• Total and digestible amino acid profiles – particularly the Critical Amino Acids (CAAV)  

• Indicators of processing quality, including urease activity, trypsin inhibitor activity, protein solubility and reactive lysine where appropriate 

• Nutrient consistency across shipments and crop years 

• The final least-cost formulation value in the target animal diet 

The right purchasing question is not, “Which soybean meal has the lowest delivered price?” It is, “Which soybean meal provides the lowest cost per unit of usable energy and digestible amino acids while supporting dependable animal performance?” 

Northern quality: A field-to-feed advantage
Northern U.S. soybeans offer a compelling value proposition when favorable growing and harvest conditions are paired with disciplined quality management through the supply chain. Cooler, drier harvest periods can reduce the risk of severe pre-processing heat exposure. Careful handling can preserve the bean. Controlled processing can protect digestible amino acid value and nutrient-based formulations can translate those advantages into measurable feed and animal performance outcomes.   

For northern soybean growers, this is an opportunity to communicate a quality story that reaches far beyond the farm gate. For processors, it reinforces the value of protecting the nutritional integrity of the incoming bean. For global soybean buyers and feed manufacturers, it is a reminder that the true value of soybean meal is not simply the protein printed on a certificate of analysis. It is the consistent, usable nutrition that reaches the animal – from field to feed to farm.   

For more detailed data, analysis, and technical support, contact Northern Soy Marketing or visit our website for the latest research and resources.