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Mechanical Electrical and Anesthetic Stunning Methods for Livestock.Pdf REVIEW ARTICLE T. Grandin-Stunning Methods for Livestock Review Article (ECG), which records electric impulses emitted from the heart, should not be used Mechanical, Electrical and as the sole indicator of unconsciousness, since an animal can still be conscious for several seconds after the heart stops beating (Croft, 1976; Nangerone and Ken­ Anesthetic Stunning Methods nett, 1963; Roberts, 1954). The ECG may be used to determine an animal's response to pain (Croft, 1952) since the cardiac pain reflex will occur in an animal for Livestock which, although completely paralyzed and unable to move, is still fully con­ scious (Croft, 1952; Roberts, 1954; Von Mickwitz and Leach, 1977; Warrington, 1974). When a new stunning method or procedure is being tested, or an old one Temple Grandin* re-evaluated, it is recommended that the EEG be used, perhaps in conjunction with the ECG. Reflex testing of a stunned animal is another method which can be readily Abstract implemented in the slaughter plant to detect animals which have not been prop­ erly stunned. However, reflex testing is not a definite indication that an animal is A good stunning method must render an animal unable to experience pain unconscious and insensible to pain since reflexes may be absent in a conscious and sensation prior to hoisting and slaughter. The three basic types of stunning animal. methods which are classified as being humane (i.e., painless) in the United States, Reflexes of the eye, conjunctiva, cornea and eyelid are the most sensitive Europe and other foreign countries are captive bolt (penetrating and simple tests for determining consciousness of animals stunned by penetrating nonpenetrating), electrical, and C02 (carbon dioxide) gas anesthesia. and nonpenetrating captive bolt, co2, or gunshot. However, these should not be The physiological mechanisms of stress are the same before and after the used to determine the effectiveness of electrical stunning, as electrical stimula­ onset of unconsciousness. The release of epinephrine as a result of stress inducers tion can cause the eyelid muscles to contract, thus masking the reflexive action has an effect on the quality of the meat and it is therefore desirable to use a stun­ (Warrington, 1974). The eye pupillary reflex to light may be used as an indicator of ning method which produces a minimum of epinephrine secretion. unconsciousness because it is not affected by electric stunning. The pupillary reflex A literature review indicates the following stunning methods most reliably is also the first indicator that an animal is returning to consciousness (Croft, 1952). rendered the animal insensible to pain and minimized detrimental effects to fore­ head. Cows, steers, heifers, calves- penetrating or nonpenetrating (where brains Indicators of Unsconsciousness by Captive Bolt are being saved) captive bolt or gunshot to the forehead. Shoot behind the poll for It is often impossible for the captive bolt operator to test eye reflexes rou­ heavy Zebu or Brahman cattle only. Market weight pigs (180-250 lb; 80-112 kg.] tinely because the animals fall down in the chute and will thus be inaccessible. -electric stunning minimum of 1.25 amps. at 300 to 600 volts with 1 to 3 second Certain bodily reactions, which occur when an animal is stunned correctly, can application time. Sheep- penetrating captive bolt, gunshot, or electric stunning be used instead. with sharp pin electrodes or electrodes soaked in brine to insure electrical contact When the animal falls after being shot or stunned with penetrating or non­ through the wool. penetrating captive bolt, it should collapse instantly. Muscle contractions in the body which result in the curling of the tail and/or tensing of the neck before the head drops should last no longer than 3 to 5 seconds. In some instances, the en­ tire body and neck will quiver just before the head finally rests on the floor. This Determining Unconsciousness is a normal reaction and is not a sign that the animal is conscious. The ears are also a good indicator of the conscious state of the animal. If the It is often difficult to determine whether an animal is truly unconscious and ears do not droop and become completely relaxed within 3 to 5 seconds the ani­ insensible to pain without special equipment. The only reliable method for meas­ mal may still be conscious. uring consciousness is the electroencephalogram (EEG), which records electric Erratic, uncoordinated reflexive movements should not be confused with impulses emitted from the brain. Another useful tool, the electrocardiogram consciousness since such movements will occur even after the head has been removed. However, when the animal is discharged from the stunning pen or restrainer, the head should be completely relaxed and immobile and the ears * Ms. Grandin is an independent livestock handling consultant and owner of Grandin Livestock Handling Systems, 617 E. Apache Blvd., Tempe, AZ 85281. Ms. Grandin visited over 65 slaughter plants should droop. If the ears or head respond to being poked with an electric prod in the United States, Mexico, Canada and England to observe stunning and slaughtering practices. In the animal may be conscious. approximately 50% of the plants, she had an opportunity to work with employees and operate equip­ ment in order to acquire a more complete understanding of the subject. This is the fourth article in a Indicators of Unconsciousness With Electric Stunning series of six appearing in the tnt 1 Stud Anim Prob. Previously published: Livestock Behavior as Related The only criterion for unconsciousness in electric stunning is the grand mal to Handling Facilities Design; Bru'ises and Carcass Damage; Designs and Specifications for Livestock Handling Equipment in Slaughter Plants. seizure (Hoenderken, 1978a,b; McGough and Madsen, 1964; Schwerdt, 1939; War- /NT 1 STUD ANIM PROB 1(4) 1980 243 242 /NT 1 STUDANIM PROB 1(4)1980 REVIEW ARTICLE T. Grandin-Stunning Methods for Livestock Review Article (ECG), which records electric impulses emitted from the heart, should not be used Mechanical, Electrical and as the sole indicator of unconsciousness, since an animal can still be conscious for several seconds after the heart stops beating (Croft, 1976; Nangerone and Ken­ Anesthetic Stunning Methods nett, 1963; Roberts, 1954). The ECG may be used to determine an animal's response to pain (Croft, 1952) since the cardiac pain reflex will occur in an animal for Livestock which, although completely paralyzed and unable to move, is still fully con­ scious (Croft, 1952; Roberts, 1954; Von Mickwitz and Leach, 1977; Warrington, 1974). When a new stunning method or procedure is being tested, or an old one Temple Grandin* re-evaluated, it is recommended that the EEG be used, perhaps in conjunction with the ECG. Reflex testing of a stunned animal is another method which can be readily Abstract implemented in the slaughter plant to detect animals which have not been prop­ erly stunned. However, reflex testing is not a definite indication that an animal is A good stunning method must render an animal unable to experience pain unconscious and insensible to pain since reflexes may be absent in a conscious and sensation prior to hoisting and slaughter. The three basic types of stunning animal. methods which are classified as being humane (i.e., painless) in the United States, Reflexes of the eye, conjunctiva, cornea and eyelid are the most sensitive Europe and other foreign countries are captive bolt (penetrating and simple tests for determining consciousness of animals stunned by penetrating nonpenetrating), electrical, and C02 (carbon dioxide) gas anesthesia. and nonpenetrating captive bolt, co2, or gunshot. However, these should not be The physiological mechanisms of stress are the same before and after the used to determine the effectiveness of electrical stunning, as electrical stimula­ onset of unconsciousness. The release of epinephrine as a result of stress inducers tion can cause the eyelid muscles to contract, thus masking the reflexive action has an effect on the quality of the meat and it is therefore desirable to use a stun­ (Warrington, 1974). The eye pupillary reflex to light may be used as an indicator of ning method which produces a minimum of epinephrine secretion. unconsciousness because it is not affected by electric stunning. The pupillary reflex A literature review indicates the following stunning methods most reliably is also the first indicator that an animal is returning to consciousness (Croft, 1952). rendered the animal insensible to pain and minimized detrimental effects to fore­ head. Cows, steers, heifers, calves- penetrating or nonpenetrating (where brains Indicators of Unsconsciousness by Captive Bolt are being saved) captive bolt or gunshot to the forehead. Shoot behind the poll for It is often impossible for the captive bolt operator to test eye reflexes rou­ heavy Zebu or Brahman cattle only. Market weight pigs (180-250 lb; 80-112 kg.] tinely because the animals fall down in the chute and will thus be inaccessible. -electric stunning minimum of 1.25 amps. at 300 to 600 volts with 1 to 3 second Certain bodily reactions, which occur when an animal is stunned correctly, can application time. Sheep- penetrating captive bolt, gunshot, or electric stunning be used instead. with sharp pin electrodes or electrodes soaked in brine to insure electrical contact When the animal falls after being shot or stunned with penetrating or non­ through the wool. penetrating captive bolt, it should collapse instantly. Muscle contractions in the body which result in the curling of the tail and/or tensing of the neck before the head drops should last no longer than 3 to 5 seconds. In some instances, the en­ tire body and neck will quiver just before the head finally rests on the floor. This Determining Unconsciousness is a normal reaction and is not a sign that the animal is conscious.
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