Danish Dairy Crisis: Government mandated ‘Methane-Reducing’ feed additive is killing cows

Bovaer already being used across the U.S. food supply.

Nov 06, 2025

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Government-funded animal studies confirm Bovaer causes cancer and infertility

John Fleetwood
Nov 05, 2025

A government-mandated “methane-reducing” feed additive called ‘Bovaer’ (here)—already linked to tumors, infertility, and residues in milk—has reportedly triggered a wave of catastrophic health problems in Danish dairy herds since its rollout on October 1, 2025.

Bovaer is developed by DSM-Firmenich (contact), which licenses the drug in Denmark directly.

Bovaer is licensed in the U.S. by Elanco (contact).

This website has been warning about Bovaer since December 2024 (here, here).

Farmers across Denmark are now reporting cows suffering from stomach cramps, fevers, miscarriages, sudden collapses, and drastic drops in milk production.

Some cows reportedly had to be euthanized.

Farmers say symptoms disappear when Bovaer is removed from the feed and return when it’s reintroduced—a pattern that’s prompted emergency calls for a government pause.

The reports are being documented by journalist Kent Nielsen on his Twitter/X account, @Kentfrihedniels.

You can see his X posts below and watch the videos underneath them.

Denmark’s new law requires large dairy farms—those with more than 50 cows—to feed Bovaer (chemical name 3-nitrooxypropanol) daily or face fines of up to 10,000 DKK (~$1,450 USD).

Background: Tumor-Linked Feed Drug Found in Cow Milk

Worldwide Push Continues Despite Mounting Evidence

Bottom Line

Denmark’s dairy crisis is the first real-world mass rollout of Bovaer under government mandate—and early results are alarming: collapsing cows, miscarriages, and dead animals.

The same compound is already being used across the U.S. food supply, classified as a “feed additive” despite FDA acknowledgment it’s a drug with reproductive and carcinogenic risks.

If Bovaer is harming cows, what is it doing to the people drinking their milk?

Details at https://jonfleetwood.substack.com/p/danish-dairy-crisis-farmers-confirm