Daniel Mota-Rojas, Dan Bolanos-Lopez, Maria Concepcion-Mendez, Jorge Ramirez-Telles, Patricia Roldan-Santiago, Salvador Flores-Peinado and Patricia Mora-Medina, 2012. Stunning Swine with CO2 Gas: Controversies Related to Animal Welfare. International Journal of Pharmacology, 8: 141-151.