13 



ing it with others, it can be marked by taking a pair of shears 

 and clipping the hair in the form of a "V" on a prominent 

 part of body, or it can be lightly marked with a branding iron. 



With a good chute and sufficient help to fill it quickly, 

 a person after a little practice can easily vaccinate 300 calves 

 per hour. 



If any calves are sick with blackleg or any other disease 

 they shonld not be vaccinated until the last and then the 

 syringe must be carefully disinfected. 



If the vaccine is properly prepared and used there are 

 no indications or symptoms following the vaccination. 



SUMMARY 



Blackleg is a genn disease attacking young cattle between 

 the ages of one month and two years of age. It does not attack 

 man. The greastest mortality occtirs in calves between sixand 

 eighteen mouths of age. Calves that are fat are most Hable 

 to suíFer from blackleg. Calves should be vaccinated against 

 blackleg when two months oíd and every six months until 

 they are 18 month oíd. The average loss from blackleg in 

 Cuba is between four and five percentin uuvaccinated calves. 

 Vaccination reduces the loss to six tenths of one percent. 

 Calves that die of blackleg should be burned or buried 

 deeply. 



Vaccine against blackleg is furni&hed free by the govern- 

 ment to cattle growers in Cuba. Application for vaccine 

 should bemade to the Hon. Secretary of Agriculture Industry 

 and Commerce, Havaua. 



