Research Note

Thinking HOSB?
Maximize Benefits, Avoid Pitfalls

U.S. soybean authorities estimate total 2025 high oleic soybean (HOSB) planting at about 1.4 million acres, which is less than 2% of total soybean acreage. Yet even with total soybean acreage at the lowest point in five years, they project HOSB acreage to nearly double by 2030, with much of the growth concentrated in the Tri-State region.

“The key benefits for dairy,” says Michigan State’s Dr. Adam Lock, “are that HOSB can increase the supply of oleic acid, which can improve nutrient absorption and partitioning.”

Previous work from Lock’s lab, highlighted in FeedInsight 4Dairy, showed positive results from more precise fatty acid supplementation during transition with carry-over effects into peak lactation using palmitic-oleic acid blends (see our 2022 Research Note.) Subsequently, the lab zeroed in on the more precise fatty acid supplementation at the “crest of cost” in mid-lactation for peak milk and milk fat production (see our 2024 Research Note.)

To maximize HOSB benefits, Lock says, roasting is critical: “Roasting increases rumen undegradable protein, enhancing the yield of milk and milk components.”

He points to a recent study showing consistent production responses with HOSB and another study comparing raw and roasted HOSB.

The Michigan State studies by Lock and Dr. Alycia Bales show good results with roasted HOSB inclusion at 8-16% dry matter. Moreover, Lock notes an “additive effect” with the inclusion of palmitic acid. Conventional by-pass fat products with palmitic acid may be viable choices.

However, he cautions against possible “pitfalls” of HOSB:

• Be aware that optimal particle size of roasted, ground HOSB requires more study
• Ensure adequate rumen fiber digestibility in the diet
• Avoid over-conditioning cows by managing feeding level and other nutrients

Currently, Lock notes, HOSB is at a premium with growers paid a bonus for this identity-preserved crop. So it can be an attractive option for dairy producers with soybean acreage, but requiring investment in roasting equipment or contracting for processing. In any case, he adds: “Dynamics in the HOSB and oil markets may present opportunities when supply outpaces demand.”

Catch the HOSB panel presentation at the 2026 Great Lakes Regional Dairy Conference where Commodity Blenders is a Gold Sponsor.

Questions?

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