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首页> 外文期刊>The Veterinary Journal >WELFARE IMPLICATIONS OF GAS STUNNING PIGS .3. THE TIME TO LOSS OF SOMATOSENSORY EVOKED POTENTIALS AND SPONTANEOUS ELECTROCORTICOGRAM OF PIGS DURING EXPOSURE TO GASES
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WELFARE IMPLICATIONS OF GAS STUNNING PIGS .3. THE TIME TO LOSS OF SOMATOSENSORY EVOKED POTENTIALS AND SPONTANEOUS ELECTROCORTICOGRAM OF PIGS DURING EXPOSURE TO GASES

机译：气体惊吓猪的福利含义3。暴露于气体期间，猪体感诱发电位的丧失时间和自发性电心电图

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Changes in the spontaneous electrocorticogram (ECoG) and somatosensory evoked potentials (SEPs) were recorded in 12 pigs in each of three gas killing treatments. The treatments were 90% argon in air with 2% residual oxygen; a mixture of 30% carbon dioxide and 60% argon in air with 2% residual oxygen; or 80-90% carbon dioxide in air. The mean times to loss of SEPs were 15, 17 and 21 s, respectively. The mean time to loss of SEPs recorded during killing with a high concentration of carbon dioxide was significantly longer than those recorded for the other two gas killing treatments (P<0.05). Slow wales (high amplitude and low frequency) appeared on average 15 s after exposure to argon. In some pigs killed with the carbon dioxide-argon mixture, a decrease in the frequency of electrical activity was apparent, although slow waves did not appear during killing with a higher concentration of carbon dioxide. A suppressed ECoG (reduction in amplitude of signals) was recorded at 22 and 20 s respectively, during exposure to the carbon dioxide-argon mixture and 80-90% carbon dioxide in air, but the onset of ECoG suppression could not be determined exactly during exposure to 90% argon in air. The time to onset of an isoelectric ECoG was 54, 39 and 32 s after exposure to argon, carbon dioxide-argon mixture and a high concentration of carbon dioxide, respectively. The mean time to the onset of an isoelectric ECoG during exposure to argon was significantly longer than that recorded for the other two gas killing treatments (P<0.05). Based on the time to loss of SEPs, it is concluded that during killing with a high concentration of carbon dioxide, pigs would have to endure a moderate to severe respiratory; distress induced with this gas for a considerable period of time prior to the loss of brain responsiveness. Argon-induced anoxia appears to be the first choice from a welfare point of view for killing pigs, based on its lack of aversive properties and its effectiveness in rapidly abolishing brain responsiveness. A mixture of 30% carbon dioxide and 60% argon in air is considered to be more humane than using a high concentration of carbon dioxide, as the time to loss of brain responsiveness is similar to that using 90% argon in air.
机译：在三种气体杀死方法中，每只猪中的12头均记录了自发性皮层脑电图（ECoG）和体感诱发电位（SEPs）的变化。处理方法是在空气中使用90％的氩气和2％的残留氧气;空气中30％的二氧化碳和60％的氩气的混合物，以及2％的残留氧气;或空气中80-90％的二氧化碳。 SEP丢失的平均时间分别为15、17和21 s。在高浓度二氧化碳的杀灭过程中记录的SEP损失的平均时间明显长于其他两种气体杀灭处理的记录时间（P <0.05）。暴露于氩气后平均15 s出现缓慢的威尔士（高振幅和低频）。在一些用二氧化碳-氩气混合物杀死的猪中，电活动的频率明显降低，尽管在杀死二氧化碳浓度较高的动物时并未出现慢波。在暴露于二氧化碳-氩气混合物和空气中80-90％的二氧化碳的过程中，分别在22和20 s处记录到抑制的ECoG（信号幅度的降低），但是在此期间无法准确确定ECoG抑制的开始时间暴露于空气中90％的氩气中。暴露于氩气，二氧化碳-氩气混合物和高浓度二氧化碳后，等电ECoG的产生时间分别为54、39和32 s。暴露于氩气期间，等电心电图的平均出现时间明显长于其他两种气体杀死方法的记录时间（P <0.05）。根据丧失SEP的时间得出的结论是，在用高浓度二氧化碳杀死动物时，猪必须忍受中度到重度呼吸;在失去脑反应能力之前的相当长的一段时间内，这种气体引起的精神困扰。从福利的角度来看，氩气引起的缺氧似乎是杀猪的首选，因为它缺乏厌恶特性，并且具有迅速消除大脑反应的功效。空气中30％的二氧化碳和60％的氩的混合物被认为比使用高浓度的二氧化碳更人性化，因为失去大脑反应能力的时间类似于在空气中使用90％的氩。

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