Efficacy of bovine stunning by penetrating captive bolt in a slaughterhouse in São Paulo State, Brazil

Abstract

Issues related to animal welfare and the humane slaughter of animals are gaining importance in the scientific community and among consumers, by the close relationship with the final quality of meat, as well to avoid unnecessary suffering on the steps leading up to slaughter. The objective of this study was to evaluate the effectiveness of stunning in cattle slaughterhouse located in the State of São Paulo. The animals were stunned by penetrating captive bolt and then observed the number of shots applied to each animal, and the presence of signs of sensitivity of animals (eye movements, rhythmic breathing, vocalization and attempts to correct posture) on bleeding. Of 200 animals evaluated, 140 (70{\%}) showed signs of unconsciousness at the first shooting, 39 (19.5{\%}) in the second and in 21 (10.5{\%}) took three or more shots. The signals observed in 14 (7{\%}) animals showed attempt to correct posture and 186 (93{\%}) showed no signs of sensitivity. The results were not satisfactory, evidencing the need to train staff responsible for the stunning stage, as well the need to use the stun box with head restraint and a real monitoring that ensures animal welfare during the time preceding slaughter.