The climate footprint of pig production is mainly from the feed. Pigs are not ruminants and do not produce much methane like cattle do. Handling of manure can be a factor, both storage and spreading will affect the loss of nitrogen and the greenhouse gas nitrous oxide.
One of the measures we have called "better pre-utilization and animal health". This can be achieved with measures in ordinary herds, but there is also a special program and system called SPF herds. There are strict requirements that pigs and buildings must be free from infection with certain diseases. Because of this, there must be a quarantine period with empty houses and this also has a cost.
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