Legalization of hemp 'very difficult' in dairy cow diets, researcher says

Study finds CBD in milk from newly lactating cows weeks after the animals appeared to clear the cannabinoids from their system.

Emma Penrod
August 1, 2025
Several dairy cows with white and brown coats eating hay in a concrete feeding stall
Andre Nery | BigStock.com

New data suggesting that cannabinoids can enter the milk supply and reappear in postpartum cows once lactation resumes could make the use of hemp as feed “very difficult” under the current U.S. regulatory framework, according to Oregon State University Associate Professor Massimo Bionaz.

The latest study from Oregon State University found that THC, the psychoactive compound typically associated with marijuana, disappeared from milk 12 days after researchers stopped feeding spent hemp biomass, and was undetectable in fat tissues after 30 days. 

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