Norway suspends Bovaer use on dairy farms until Danish issues clarified. Danish farmers report cow collapses, distress, and reduced milk after Bovaer introduction. Over 100 Danish farmers faced problems per sector survey. Half of affected farmers stopped Bovaer and saw cow issues subside. Bovaer cuts rumen methane 30% by inhibiting key enzyme. Denmark mandates Bovaer or fat feeding for large dairy farms since 2025. Norway planned Bovaer rollout from 2027 for climate goals. No proven causality yet but investigations ongoing. EU approved Bovaer for dairy cows in 2022 as safe. Regulators stress dose and farm conditions affect outcomes. Pause precautionary, not safety ban. Nordic authorities demand more real-world data before scaling. Episode highlights methane cuts versus cow welfare trade-off.