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Testimonial about production using pigs that are not tail docked, including strategies for preventing tail biting:

Norwegian with English captions

Films about production using pigs that are not tail docked:

English 

Danish

Dutch

French

German

Italian

Polish

Spanish

Information video about natural behaviour in pigs

The pigs tail as a welfare indicator

Flowchart for handling problems with tail biting (Norwegian)

Norwegian resources related to tail biting prevention