12 



calves two months oíd and over. Calves two to three mónths 

 oíd should be given one-half dose, four months three-fourths 

 dose, and over four months a full dose of one cubic centiineter. 

 Calves should be vaccinated every six months until they are 

 18 months oíd, particularly if there has been auy blacklegon 

 the farm. 



PREPARING THE VACCINE. 



The vaccine should not be prepared until it is to be 

 used. After it is prepared it should notbe kept longer than six 

 or eight hours. Prepare the vaccine as follows. First cleau 

 and disinfect all the instruments. Have some clean water 

 that has been boiled and cooled. Place the contents of a 

 packet of vaccine in the mortar and add a few drops of water, 

 just sufficient to make the vaccine into a paste, with the 

 pestle rub it well for ten minutes, after it is thoroughly ground 

 add 10 c. c. of the boiled water for a ten dose packet of 

 vaccine and 25 c. c. of water for a 25 dose packet. Mix it 

 thoroughly and put in the clean glass stoppered bottle when 

 it is ready for use. 



HOW TO VACCINATE. 



The best method of confining the calves is in a narrow 

 chute crowciing them as closely as possible. The needle 

 should be placed on the syringefilled with the prepared liquid 

 vaccine, care being taken to exelude all air. The dose can be 

 regulated by a sinall screw on the pistón of the syringe. 



The most convenient place to vaccinate is on the side 

 of the neck, just in front of the shoulder where the skin is 

 loóse and thin. Grasp the needle firmly between the thumb 

 and index finger of the right hand, with the left hand grasp 

 ihe skin on the left si-le of the calf's neck pulling it outward. 

 Push the needle quickly but firmly through the skin and 

 inject the required dose. If the needle is inserted quickly the 

 calf will scarcely flinch. The needle should always be kept 

 sharp. If dull it can be sharpened on a whetstone. 



When a calf is vaccinated and there is danger of confound- 



