While all commercial chicken abattoirs in Australia attempt to stun chickens prior to slaughter (including halal chicken), some halal killing of sheep, cattle and goats does not involve pre-slaughter stunning.
Halal slaughter of sheep involves the cutting of both the carotid arteries and jugular veins. If they are not completely severed, the animal is then supposed to be stunned.
Cattle are kept in an upright position with the head and body restrained. After their throats are cut, they are stunned with a captive bolt pistol. Compared to sheep, cattle have an extra blood supply to the brain through the back of the neck, so cutting their throat does not lead to unconsciousness as quickly.