WARNING…BLUNT WORDS FOLLOWING… NOT FOR THE SENSITIVE
For anyone who thinks that electrocution is an exceptable form of euthanasia you need to go over to Google and get a copy of the AVMA Guide to Euthanasia.
This quote is from that source. While electric current is used, particularly in the fur industry you can see that it is neither fast nor simple.
Edited to remove footnote reference numbers, bolding mine
I do not, for a moment, believe the case under discussion involved a one-step death
Electrocution, using alternating current, has been used as a method of euthana Electrocution induces death by cardiac fibrillation, which causes cerebral hypoxia. However, animals do not lose consciousness for 10 to 30 seconds or more after onset of cardiac fibrillation. It is imperative that animals be unconscious before being electrocuted. This can be accomplished by any acceptable means, including electrical stunning. Although an effective, 1step stunning and electrocution method has been described for use in sheep and hogs, euthanasia by electrocution in most species remains a 2-stepprocedure.
Advantages—(1) [B]Electrocution is humane if the animal is first rendered unconscious.[/B] (2) It does not chemically contaminate tissues. (3) It is economical.
Disadvantages—(1) Electrocution may be hazardous to personnel. (2) When conventional single-animal probes are used, it may not be a useful method for mass euthanasia because so much time is required per animal. (3) It is not a useful method for dangerous, intractable animals. (4) It is aesthetically objectionable because of violent extension and stiffening of the limbs, head, and neck. (5) It may not result in death in small animals (< 5 kg) because ventricular fibrillation and circulatory collapse do not always persist after cessation of current flow. [B]Recommendations—Euthanasia by electrocution requires special skills and equipment that will ensure passage of sufficient current through the brain to induce loss of consciousness and cardiac fibrillation in the 1-step method for sheep and hogs, or cardiac fibrillation in the unconscious animal when the 2-step procedure is used.[/B] Although the method is conditionally acceptable if the aforementioned requirements are met, its disadvantages far outweigh its advantages in most applications. Techniques that apply electric current from head to tail, head to foot, or head to moistened metal plates on which the animal is standing are unacceptable.