1 Department of Behavioral Physiology of Livestock (460f), Institute of Animal Science, University of Hohenheim, Garbenstraße 17, 70593 Stuttgart, Germany.
2 IRTA-Product Quality, Finca Camps i Armet, 17121 Monells, Spain.
3 Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Serbia.
4 IFIP Institut du Porc, La Motte au Vicomte, 35650 Le Rheu, France.
Because castrated male pigs convert feed into meat less efficiently than entire males, they are less efficient regarding the utilization of resources [...].