DEPARTMENT OF AGRICULTURE  
ANIMAL INDUSTRY DIVISION  
REGULATION NO. 146. HUMANE SLAUGHTER METHODS  
(By authority conferred on the department of agriculture by Act No. 163 of the Public Acts  
of 1962, being S287.551 et seq. of the Michigan Compiled Laws)  
R 285.146.1 Humane slaughter methods.  
Rule 1. (1) For the purpose of this rule the following terms shall be construed,  
respectively, to mean:  
(a) "The act." Act No. 163 of the Public Acts of 1962.  
(b) "Director." The director of the Michigan department of agriculture.  
(c) "Division." Livestock disease control division of the Michigan department of  
agriculture.  
(d) "Inspectors." Inspectors of the division.  
(e) "Carbon dioxide." A gaseous form of the chemical formula CO2.  
(f) "Carbon dioxide concentration." Ratio of carbon dioxide gas and atmospheric air.  
(g) "Exposure time." The period of time an animal is exposed to an anesthesia-producing  
carbon dioxide concentration.  
(h) "Anesthesia." Loss of sensation or feeling.  
(i) "Surgical anesthesia." A state of unconsciousness measured in conformity with  
accepted surgical practices.  
(j) "Consciousness." Responsiveness of the brain to the impressions made by the senses.  
(k) "Captive bolt." A stunning instrument which when activated drives a bolt out of a  
barrel for a limited distance.  
(2) No person engaged in, or in charge of, slaughter or preparation of animals for slaughter  
shall obstruct, hinder, or interfere with the director of agriculture or his authorized  
representatives in performing such inspections as the director of agriculture or his  
authorized representatives shall deem to be necessary to determine if humane methods of  
slaughtering and preparation for slaughter are being practiced in any meat processing  
establishment, slaughterhouse or stock yard. Such inspection may be performed without  
prior notice to the operator or owner of the establishment.  
(3) Designation of methods:  
(a) Chemical: Carbon dioxide. The slaughtering of sheep and swine with the use of carbon  
dioxide gas and the handling in connection therewith, in compliance with the provisions  
contained in this subrule, are hereby designated and approved as humane methods of  
slaughtering and handling such animals under the act. The carbon dioxide gas shall be  
administered in a chamber in accordance with this subrule so as to produce surgical  
anesthesia in the animals before they are shackled, hoisted, thrown, cast, or cut. The  
animals shall be exposed to the carbon dioxide gas in a way that will accomplish the  
anesthesia quickly and calmly, with a minimum of excitement and discomfort to the  
animals.  
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(b) Mechanical:  
(i) Captive bolt. The slaughtering of sheep, swine, goats, calves, cattle, horses, and mules  
by using captive bolt stunners and the handling in connection therewith, in compliance  
with the provisions contained in this subrule, are hereby designated and approved as  
humane methods of slaughtering and handling of such animals under the act. The captive  
bolt stunners shall be applied to the livestock in accordance with this section so as to  
produce immediate unconsciousness in the animals before they are shackled, hoisted,  
thrown, cast, or cut. The animals shall be stunned in such a manner that they will be  
rendered unconscious with a minimum of excitement and discomfort. Immediately after  
the stunning blow is delivered, the animals shall be in a state of complete unconsciousness  
and remain in this condition throughout shackling, sticking, and bleeding.  
(ii) Gunshot. The slaughtering of cattle, calves, sheep, swine, goats, horses, and mules by  
shooting with firearm is hereby designated and approved as humane method of slaughter.  
The firearm shall be employed in the delivery of a bullet or a projectile from a barrel  
containing rifling into the animal so as to produce immediate unconsciousness in the  
animal by a single shot before it is shackled, hoisted, thrown, cast, or cut. The caliber and  
choice of firearm shall be such as to render the animal unconscious with a single shot, but  
caliber shall not exceed .25 caliber.  
(c) Electrical. Stunning with electric current. The slaughtering of swine, sheep, calves,  
and cattle with the use of electric current and the handling in connection therewith, in  
compliance with the provisions contained in this subrule, are hereby designated and  
approved as humane methods of slaughtering and handling of such animals under the act.  
(i) The electric current shall be administered so as to produce surgical anesthesia in the  
animals before they are shackled, hoisted, thrown, cast, or cut. The animals shall be  
exposed to the electric current in away that will accomplish the anesthesia quickly and  
calmly, with a minimum of excitement and discomfort to the animals.  
(ii) Each animal shall be given a sufficient application of electric current to insure  
unconsciousness immediately and through the bleeding operation.  
History: 1979 AC.  
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