288 PRODUCTION AND DISTRIBUTION OF CERTIFIED MILK 



to be obtained and applied only by the official veterinarian of 

 the commission. 



47. Immediately following the application of the tuberculin 

 test to a herd for the purpose of eliminating tuberculous cattle, 

 the cow stable and exercising yards shall be disinfected by the 

 veterinary inspector in accordance with the rules and regula- 

 tions of the United States Government. 



48. A second tuberculin test shall follow each primary test 

 after an interval of six months, and shall be applied in accord- 

 ance with the rules and regulations mentioned. Thereafter, 

 tuberculin tests shall be reapplied annually, but it is recom- 

 mended that the retests be applied semi-annually. 



49. Identification of Cows. — Each dairy cow in each of the 

 certified herds shall be labeled or tagged with a number or mark 

 which will permanently identify her. 



50. Herd-book Record. — Each cow in the herd shall be reg- 

 istered in a herd book, which register shall be accurately kept 

 so that her entrance and departure from the herd and her tuber- 

 culin testing can be identified. 



51. A copy of this herd-book record shall be kept in the 

 hands of the veterinarian of the medical milk commission under 

 which the dairy farm is operating, and the veterinarian shall be 

 made responsible for the accuracy of this record. 



52. Dates of Tuberculin Tests.— The dates of the animal 

 tuberculin tests shall be definitely arranged by the medical milk 

 commission, and all of the results of such tests shall be recorded 

 by the veterinarian and regularly reported to the secretary of 

 the medical milk commission issuing the certificate. 



53. The results of all tuberculin tests shall be kept on file by 

 each medical milk commission, and a copy of all such tests 

 shall be made available to the American Association of Medical 

 Milk Commissions for statistical purposes. 



54. The properly designated officers of the American Asso- 

 ciation of Medical Milk Commissions should receive copies of 

 reports of all of the annual, semi-annual, and other official 

 tuberculin tests which are made and keep copies of the same on 

 file and compile them annually for the use of the association. 



