1. Valros A, Ahlström S, Rintala H, Häkkinen T, Saloniemi H: The prevalence of tail damagae in slaughter pigs in Finland and associations to carcass condemnations. Acta Agric Scand, Sec A, Anim Sci. 2004, 54: 213-219.
2. Keeling L, Larsen A: What are the characteristics of tail biting pigs?. 2004, Billingen, Skovde, Sweden: Proceedings of Svenska djurhalsovardens fortbildningskonferens
3. EFSA: Scientific opinion of the panel on animal health and welfare on a request from commission on the risks associated with tail biting in pigs and possible means to reduce the need for tail docking considering the different housing and husbandry systems. EFSA J. 2007, 611: 1-13.
4. Wallgren P, Lindahl E: The influence of tail biting on performance of fattening pigs. Acta Vet Scand. 1996, 37: 453-460.
5. Walker PK, Bilkei G: Tail-biting in outdoor pig production. Vet J. 2006, 171: 367-369. 10.1016/j.tvjl.2004.10.011.