In five studies on over 1,500 cattle slaughtered commercially by the halal methods the number of cuts applied to the neck, the cutting methods and the frequency of complications during the bleeding period were summarized. Complications during the bleeding period that occurred in some cattle included the delay in the time to collapse, which was interpreted as late loss of consciousness.
When cattle were not restrained following the halal cut, they took on average 20 s to collapse. Fourteen percent stood up again after an initial collapse, and 1.5% took more than 4 min before their final collapse. Eight percent took 60 s or longer to collapse, and those animals were more likely to have false aneurysms in the severed ends of the carotid arteries.
Gregory, NG; von Wenzlawowicz, M; von Holleben, K; Fielding, HR; Gibson, TJ; Mirabito, L; Kolesar, Source: Animal Welfare, Volume 21, Supplement 2, June 2012 , pp. 81-86(6)
