APPENDIX 307 



The preceding paragraphs 1 and 6, as applied to anti- 

 hog-cholera serum and hog-cholera virus, shall become 

 and be effective on and after May 1, 1921; as to other 

 products they will be effective on and after January 1, 

 1922. 



REGULATION 17. ANIMALS 



SECTION 3. Paragraph 1. All hogs which are admit- 

 ted to the premises of licensed establishments under the 

 provisions of section 1, paragraph 1, of this regulation, 

 shall be held in receiving pens for at least 24 hours after 

 admission to the premises, with the exception of pigs 

 which are used in testing the potency and purity of 

 anti-hog-cholera serum, in which case 6 hours will be 

 sufficient ; and during this time all of these animals shall 

 be allowed free range and contact with not less than 

 2 contact calves for each lot of 200 hogs or less in the 

 receiving pens. 



