492 DISEASES OF SWINE 



smaller amount of serum in comparison to size than is used in the 

 smaller pigs. 



The results in this herd also offer conclusive proof of the fact 

 that it is not too late to accomplish a great amount of good with 

 the serum treatment even after the disease has made its appearance 

 in a herd. Use of the serum should be advised even in infected 

 herds unless the animals are so far advanced in the disease as to be 

 plainly hopeless. Even in the cases that are well advanced surpris- 

 ing results are now being reported by the use of large doses of 

 serum. In the case of valuable pure-bred animals there should be 

 no hesitancy in making use of the chance that offers. 



While working in Pettis County, Missouri, in the summer of 

 1913 I injected, in company with other Bureau of Animal Industry 

 veterinarians, a sow and litter of pigs that were well advanced with 

 the disease. The sow was very sick, refused all food, and was 

 scarcely able to stand. The pigs were also markedly affected, and 

 all showed a high temperature at time of injection. In this case 

 large doses of serum alone were used. Each of the little fellows, 

 weighing about 20 pounds each, received an injection of 30 c.c. 

 of serum, while the old sow received 100 c.c. 



As the temperatures in these animals were very high, little or 

 no hope was expressed for a favorable outcome, the use of the 

 serum in this case being purely an experiment. The results ob- 

 tained, however, were most surprising. Only one of the pigs died 

 after receiving treatment. The old sow and the balance of the 

 litter made a brilhant recovery, and were unquestionably saved by 

 the large doses of serum that they had received. 



Herd Number Thirty-six. — This herd was located in the 

 northeast quarter of Section 8, Grant Township, and when first 

 seen on November 8, 1907, was thought to be infected with hog- 

 cholera. One old sow in the herd showed s^miptoms resembling 

 those of cholera at the time the first inspection was made. As 

 it was regarded as probable that the disease already existed in 

 the herd, serum alone was used. 



Four old sows were each given 40 c.c. of the serum. Seven 

 young boars, each weighing about 150 pounds, were injected with 

 20 c.c. each of serum, and 3 shoats of larger size were given 30 c.c. 

 each. The old sow which was sick and a number of shoats of 



