Newhook J C, Blackmore D K
Faculty of Veterinary Science, Massey University, Palmerston North, New Zealand.
Meat Sci. 1982 Apr;6(3):221-33. doi: 10.1016/0309-1740(82)90031-6.
The time of onset of permanent insensibility, subsequent to incision of the major blood vessels of the neck, was studied in sixteen adult sheep and five one-week-old lambs. Insensibility was determined from the study of electroencephalograms (EEG) and interpretation was based on the amplitude and pattern of fast wave signals of a transhemispheric bipolar derivation. In both adult sheep and lambs, conscious at the time of slaughter, insensibility occurred within 2 to 7 s and EEG traces became isoelectric between 10 and 43 s. In sheep which were lightly anaesthetised at the time of slaughter, EEG traces became isoelectric between 18 and 70 s after incision of the major blood vessels of the neck. In one sheep which was slaughtered by severance of the carotid artery and jugular vein on one side of the neck only, the onset of insensibility was delayed for 29 s. In the majority of animals, the electrocardiogram (ECG) continued to show a normal pattern for more than 10 min after slaughter. There was an initial rise in blood pressure in the first 5 to 7 s and it remained elevated for a further 10 to 20 s. The results of this work are discussed with reference to definition of death appropriate for statutory purposes and the implications for the humane slaughter of sheep.
在16只成年绵羊和5只1周龄羔羊身上，研究了颈部主要血管切开后永久性昏迷的开始时间。通过对脑电图（EEG）的研究来确定昏迷状态，其解读基于跨半球双极导联快速波信号的幅度和模式。在成年绵羊和羔羊中，屠宰时均处于清醒状态，昏迷在2至7秒内出现，脑电图痕迹在10至43秒之间变为等电位。在屠宰时轻度麻醉的绵羊中，颈部主要血管切开后18至70秒内脑电图痕迹变为等电位。在一只仅通过切断颈部一侧的颈动脉和颈静脉进行屠宰的绵羊中，昏迷的开始延迟了29秒。在大多数动物中，屠宰后心电图（ECG）在超过10分钟内仍显示正常模式。在最初的5至7秒内血压有一个初始升高，并在接下来的10至20秒内保持升高。结合适用于法定目的的死亡定义以及对绵羊人道屠宰的影响，对这项工作的结果进行了讨论。
