Velarde, A Survey of the effectiveness of stunning procedures used in Spanish pig abattoirs. [electronic resource] - The Veterinary record Jan 2000 - 65-8 p. digital Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't ISSN: 0042-4900 Standard No.: 10.1136/vr.146.3.65 doi Subjects--Topical Terms: Abattoirs--instrumentationAnimalsCarbon DioxideElectricityInjury Severity ScoreSpainSurveys and QuestionnairesSwine--physiologyUnconsciousness--physiopathology