BUREAU OF ANIMAL INDUSTRY. 



189 



stamp out the disease ; but where so many animals have been exposed, 

 and where the contagion has been sown broadcast over the pastures of 

 half a dozen farms, experience shows that it is next to impossible to 

 remove all danger except by killing all animals exposed and quaran- 

 tining the farms for a long time. 



MARYLAND. 



Owing to the variety of reports in regard to the existence of pleuro- 

 pneumonia in Maryland, Dr. Eose was directed to proceed to Balti- 

 more during the last week of October, 1883, and examine a sufficient 

 number of stables to form a basis for conclusions in. regard to the dis- 

 tribution of the disease in that section. The cases of sickness men- 

 tioned are only those in which the symptoms indicated pleuro-pneu- 

 monia. The following is a list of stables in the order in which they 

 were examined, with a condensed summary of the information ob- 

 tained : 



Stable No. 1 : Contains thirty-five cows. One chronic case, two recent deaths. 

 Stable No. 2 : Thirteen cows. No disease. 



Stable No. : Sixteen cows. One chronic case, two recent deaths. 

 Stable No. 4 : Seven cows. No information. 



Stable No. 5 : Nineteen cows. Admit that cows are exchanged as soon as they 

 show signs of disease. 



Stable No. 6 : Nine cows. Three recent deaths. 



Stable No. 7: Two cows. Admits recent deaths from lung disease. 



Stable No. 8 : Thirteen cows. Two recent deaths from acute lung disease. 



Stable No. 9 : Seventeen cows. Have lost many in the past. All are now well. 



Stable No. 10: Eighteen cows. Have lost two during the summer. 



Stable No. 11 : Nineteen cows. Would neither allow an examination nor give in- 

 formation. 



Stable No. 12 : Seven cows. None sick. No information. 

 Stable No. 13 : Eleven cows. None sick. 



Stable No. 14 : Fifty-six cows. One acme and four chronic cases of pleuro-pneu- 

 monia. Have lost heavily in past years. 



Stable No. 15: Eighteen cows. Five sick with acute lung disease within two 

 months, of which three died. 



Stable No. 16: Forty-two cows. Acknowledge a loss of over 200 cows from lung 

 disease within three years. Several now coughing. 



Stable No. 17 : Fifty animals. Xo disease. 



Stable No. 18: Thirty-six animals. No disease. 



Stable No. 19: Original herd 12 animals. Three diedduriug September and October. 



Calf died in October which State Veterinarian examined and pro- 

 nounced affected with pleuro-pneumonia. Three still sick with 

 same disease. First cow to sicken came from another stable in 

 Baltimore within a few weeks. 



The herds in the nineteen stables referred to above contained 398 ani- 

 mals, of which 12 were found to be sick or only partially recovered at 

 the time of inspection; 3 cows had recently been exchanged while sick, 

 and 18 recent deaths had occurred. The total number of animals which 

 had recently sickened with symptoms of pleuro-pneumonia in the above 

 stables was, consequently, 33, or 8.3 per cent. 



This inspection, while it cannot be taken a/S a very accurate indica- 

 tion of the proportion of the Baltimore dairy cattle which are con- 

 stantly affected with pleuro-pneumonia, is nevertheless sufficient to 

 show that a very large proportion of the stables are infected, and that 

 many cases of the disease occur. 



A considerable number of inoculation and cohabitation experiments 

 have been made and are still in progress, and will be given in detail iu 

 the First Annual Report of the Bureau of Animal Industry. 



