Soybean variety and growing conditions linked to feed value differences in new Illinois study

A newly published study in the journal Animals has found that soybean variety, growing location, crop year, and relative maturity can significantly affect the nutrient composition of soybeans grown in southern Illinois — with downstream consequences for modeled soybean meal quality and livestock diet formulation.

The researchers analysed seed samples from 47 soybean varieties collected across two southern Illinois locations over two crop years. The team assessed seed crude protein and amino acid concentrations, generated modeled soybean meal values, and compared relative livestock feed value scores across the sample set, according to the study record.

The paper found that shifts in crude protein and amino acid profiles can materially change relative livestock feed value scores and alter the proportions of soybean meal and corn used in modeled rations for both non-ruminants and ruminants. Related work from the same research group indicates that higher-crude-protein, higher-feed-value soybean meal can reduce soybean meal inclusion in swine and poultry diets, increase corn inclusion, and lower modeled greenhouse gas and nitrogen emissions per tonne of feed.

The findings add peer-reviewed support to the argument that soybean value is not determined solely by yield or whole-bean metrics. Illinois soybean groups, including through the HY+Q initiative, have previously argued that variety-level differences in amino acid profile and meal quality can create meaningful but underrecognised value differences for livestock customers, and that standard whole-bean metrics such as yield, protein, and oil do not always predict the true value of soybean meal in finished diets.

The new study fits within a broader precision nutrition trend in which better upstream ingredient characterisation is seen as a route to improved downstream formulation decisions. Recent feed formulation research has underscored that soybean meal value depends on more than commodity assumptions, because amino acid concentration, digestibility, and energy all affect least-cost formulation outcomes in poultry and swine diets.

For feed manufacturers and integrators, the work raises the question of whether variety-level soybean differences could eventually translate into procurement standards that document quality beyond standard protein and oil benchmarks. However, the study authors and observers note that broader commercial uptake will likely depend on whether future research can demonstrate consistent animal performance, economic returns, or environmental gains under commercial conditions. The gap between modeled feed value and validated live-animal performance remains a key outstanding question.