270 HOG CHOLERA 



their physical condition. No animal shall be removed 

 from receiving pens without examination by and the 

 permission of a veterinary inspector. 



Paragraph 2. After examination, if the animals are 

 permitted to remain upon the premises and to gain en- 

 trance to the holding pens of the establishment, they 

 shall be given serially numbered metal tags, either prior 

 to or at the time of inoculation or hyperimmunization. 



Paragraph 3. All tags used for the identification of 

 animals shall be attached to the ears of the animals in 

 a manner satisfactory to the inspector in charge. The 

 tags so attached shall be the means of assisting in identi- 

 fying the animals so long as they remain on the premises. 



Paragraph 4. All tags which are used to identify ani- 

 mals shall be furnished and attached by the licensed 

 establishment, and when said tags are not in actual use 

 they shall at all times be held in the custody of a bureau 

 employee. 



Paragraph 5. When practicable, the left ear of each 

 animal used in testing the purity and potency of viruses, 

 serums, toxins, and analogous products shall be pierced 

 with a hole not less than three-fourths of an inch in 

 diameter. Animals bearing marks of the above-de- 

 scribed character shall not be used more than once by 

 licensed establishments in testing the purity and po- 

 tency of any virus, serum, toxin, or analogous product. 

 Furthermore, animals with the left ear removed or 

 mutilated so as to prevent the detection of this identi- 

 fying mark shall not be used in any test. 



SECTION 7. Animals used in the production or testing 

 of viruses, serums, toxins, or analogous products shall 

 not be treated with biological products other than those 

 which are incidental to the preparation and testing of 

 the products prepared from or tested upon said animals, 

 except with the approval of and in such manner as may 

 be prescribed by the chief of bureau. 



