Warris et al. Electrical stunning of pigs on the floor is most practical for abattoirs that slaughter under 240 pigs per hour. The author has observed that floor stunning often becomes rough and sloppy at higher speeds. In larger plants, a well designed race will produce less stress than a poor one. Weeding et al.
Pigs move more easily through a ramp where they walk up side by side.
On the diagram illustrating a well designed pig race, the double chute is recommended. However, if space restriction is an issue, notice the diagram does promote pigs natural following behavior and prevents jamming with an offset step at the entrance of the chute.