Welfare of Animals in Biogas Production from Agricultural Waste

Biogas production from animal manure and agricultural waste can improve farm environmental sustainability while affecting animal welfare through manure management changes.

Key Facts

Anaerobic digesters convert animal waste to biogas and nutrient-rich digestate
Proper slurry storage before digestion can reduce ammonia emissions that harm respiratory health in housed livestock
Biogas systems reduce the smell of intensive livestock operations, potentially improving animal behavior
Some biogas production requires liquid slurry systems incompatible with straw bedding that improves animal welfare

Welfare Considerations

Biogas production welfare effects are mixed. Systems that reduce ammonia emissions from stored slurry improve air quality in livestock buildings, directly benefiting animal respiratory health and reducing eye and mucous membrane irritation. Reduced ammonia also benefits animals in surrounding fields and wildlife in nearby habitats. However, some biogas system designs require liquid slurry systems that make straw bedding provision difficult or impossible, removing a welfare-positive housing element for pigs and cattle. The welfare net effect of biogas adoption depends on system design — systems that maintain or improve bedding while reducing emissions are welfare-positive overall.

What You Can Do

Support biogas system designs that maintain animal welfare through bedding provision
Advocate for farm environmental subsidy programs that require welfare maintenance alongside emissions reduction
Choose animal products from farms that have adopted emissions reduction technologies without welfare compromise
Support research into biogas system designs compatible with high welfare livestock housing