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Recovery of consciousness in hogs stunned with CO2: physiological responses
D Bolaños-López1, D Mota-Rojas2, I Guerrero-Legarreta3
1Programa de Doctorado en Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana Iztapalapa-Xochimilco-Cuajimalpa, Calzada del Hueso 1100, Col. Villa Quietud, Mexico, D.F. 04960, Mexico.
Abstract:
The objective of the present study was to determine the impact of recovering consciousness on physiological responses in hogs stunned with different concentrations of CO2. A total of 1336 pigs were moved into a CO2 anaesthesia chamber for 90s. The remaining pigs were assigned to 3 groups according to the CO2 concentration used for stunning: 85, 90 or 95%. Each group was then further divided into 2 sub-groups: those exsanguinated during the first 60s after leaving the chamber without recovering consciousness (WRC); and those exsanguinated after more than 60s that recovered consciousness (RC). The blood pH of the RC pigs decreased below 7.08, but their blood levels of Ca(2+) (>1.59mmol/L), glucose (>159.79mg/dL), and lactate (>103.52mg/dL) all increased when compared to reference values (RV) (P<0.05). Therefore, a greater metabolic and energy imbalance occurs during exsanguination when pigs recover consciousness. In conclusion, exsanguination should be performed immediately upon the pigs leaving the CO2 chamber.
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