268 HOG CHOLEEA 



cholera which are admitted to the premises of licensed 

 establishments under the provisions of section 1, para- 

 graph 1, of this regulation shall be held in receiving 

 pens for at least 24 hours after admission to the premises 

 and during this time they shall be allowed free range 

 and contact with not less than 4 contact calves for each 

 lot of 200 hogs or less in the receiving pens. 



Paragraph 2. Hogs which are immune to hog cholera, 

 admitted to the premises of licensed establishments un- 

 der the provisions of section 1, paragraph 1, of this 

 regulation, shall be held in receiving pens with contact 

 calves as prescribed in the preceding paragraph for at 

 least 48 hours. 



Paragraph 3. All animals covered by section 1, of this 

 regulation, except hogs, shall be held in receiving pens 

 for at least 48 hours as prescribed in paragraph 1, of 

 this section, except that not less than two contact calves 

 shall be used for each lot of 20 animals or less in the 

 same pen. 



SECTION 4. Paragraphl. All surviving contact calves 

 shall be held in the receiving pens of licensed establish- 

 ments for at least one month and not to exceed four 

 months from date of admission to receiving pens as 

 contact calves. 



Paragraph 2. Removal of contact calves from receiv- 

 ing pens shall be so arranged that a rotation will be es- 

 tablished whereby one of the animals will be replaced at 

 intervals of one month and the entire group replaced 

 every four months or less. 



Paragraph 3. Removal of contact calves from receiv- 

 ing pens shall be accomplished so that the animals last 

 furnished for the purpose may be used for the maximum 

 time permitted by the preceding paragraphs of this 

 section. No contact calf shall be used as such more than 

 once. 



Paragraph 4. Contact calves shall be carefully ob- 



