494 HORSE, SWINE 'AND POULTRY DISEASES 



his purchase will be condemned for tuberculosis, and as the post- 

 mortem examination is the only key to the extent of the disease, 

 the careful breeder must suffer equally with the careless one. This 

 is not equitable. When the packer buys subject to the post-mortem 

 results the intelligent hog raiser will get more for his healthy hogs 

 than he does now, and the ignorant breeder will get less for his 

 tuberculous hogs, which is as it should be. 



It would be money well expended if butchers and packers who 

 are losing so much from hog tuberculosis would employ veterin- 

 arians in their vicinity to write popular articles giving correct 

 views on how to suppress tuberculosis on the farm and mail them 

 to their hog shippers and hog raisers in furtherance of this plan of 

 eradication. Extermination of hog tuberculosis is practicable, rel- 

 atively easy, and should be attained without delay before the dis- 

 ease has gained too much headway. 



One of the favorable steps in this direction, and one that will 

 undoubtedly tend to check the advance of tuberculosis, is the en- 

 forcement of laws similar to the following, which have been en- 

 acted by the States of Iowa and Minnesota. Laws of the Thirty- 

 First General Assembly of Iowa (1906) : 



SECTION 1. That every owner, manager, or operator of a 

 creamery shall before delivering to any person any skimmed milk 

 cause the same to be pasteurized at a temperature of at least one 

 hundred and eighty-five (185) degrees Fahrenheit. 



SECTION 2. "Whoever violates the provisions of this act shall, 

 upon conviction, be liable to a fine of not less than twenty-five ($25) 

 dollars nor more than one hundred ($100) dollars. 



General laws of Minnesota for 1903, to prohibit and prevent 

 the manufacture or sale of unhealthful or adulterated dairy products : 



SECTION 10. That all creameries before delivering to any 

 patron any skimmed or separated milk shall have pasteurized the 

 same at a temperature of at least 180 F. 



Similar laws to the above are at present being considered for 

 Wisconsin and Illinois, but have not as yet been enacted. (B. A. 

 I. Cir. 144.) 



INFECTIOUS CATARRHAL PNEUMONIA. 



Causes. There is a form of catarrhal pneumonia of pigs that 

 is without doubt of infectious character. The infectious nature is 

 established from the clinical history rather than from the finding 

 of a specific organism. It affects pigs under four months of age 

 principally, and is not attended with a very high death rate in 

 those over two months of age. When the disease is introduced 

 into a piggery, it is almost certain to attack all susceptible animals. 

 The period of incubation, that is the time elapsing from the period 

 of exposure to that of the development of the illness is from ten to 

 fifteen days. The young pigs become affected first, while a large 

 percentage of those over four months will escape. 



Symptoms. The first and most prominent symptom is that 

 of coughing and this persists throughout the entire course of the 

 affection. There is also more or less difficulty in breathing. The 



