Potential synergies and trade-offs between GHG and ammonia emissions from dairy cattle (ENRA 2025 poster)

Nutritional interventions to reduce enteric methane or ammonia emissions from cattle are applied with no consideration for trade-offs with other gaseous emissions. Lack of facilities measuring multiple gases simultaneously means there is little data to investigate trade-offs. We conducted a meta-analysis of published studies investigating enteric methane or ammonia mitigation from dairy cows where both gases were measured or one could be estimated by proxy. We found potential for win-win scenarios, particularly with ammonia mitigation strategies. Studies measuring multiple gases and quantifying trade-offs and synergies between strategies would lead to cohesion between climate change, environmental protection and air quality policies.