Blackmore D K, Newhook J C
Department of Veterinary Pathology and Public Health, Massey University, Palmerston North.
N Z Vet J. 1981 Dec;29(12):219-22. doi: 10.1080/00480169.1981.34850.
The onset of insensibility during slaughter was studied in five, 31-day-old pigs. The state of sensibility was determined from the study of electroencephalograms (EEC) which were of a bipolar transhemispheric derivation. In 3 pigs slaughtered by bilateral severance of both common carotid arteries and jugular veins, it was judged that insensibility occurred within 25 s and there was no resurgence of cerebrocortical activity following subsequent respiratory gasps. The EEGs became isoelectric within 115 s. These results are compared with previous findings by the authors that adult sheep and lambs slaughtered by similar techniques became insensible within 7 s whereas, in calves, the onset of insensibility was delayed for up to 85 s and there were resurgences of cerebrocortical activity, following a respiratory gasp, for more than 300 s. These differences in the apparent onset of insensibility in the 3 species of animal are discussed in relation to the anatomical features and possible dynamics of the blood supply to the brain during slaughter. It is concluded that for humane reasons, head-to-back electrical stunning of pigs is preferable to a head-only method.
对五只31日龄的猪在屠宰过程中失去知觉的起始情况进行了研究。通过对双极跨半球导联的脑电图（EEC）进行研究来确定其感觉状态。在3只通过双侧切断双侧颈总动脉和颈静脉进行屠宰的猪中，判断其在25秒内失去知觉，随后呼吸喘息后未出现大脑皮质活动的复苏。脑电图在115秒内变为等电位。这些结果与作者之前的发现进行了比较，即采用类似技术屠宰的成年绵羊和羔羊在7秒内失去知觉，而在小牛中，失去知觉的起始延迟长达85秒，并且在呼吸喘息后大脑皮质活动复苏超过300秒。结合屠宰过程中大脑血液供应的解剖特征和可能的动态情况，讨论了这三种动物在明显失去知觉起始方面的这些差异。得出结论，出于人道原因，对猪进行头到背部电击致昏优于仅对头进行电击的方法。
