DAIRY HERD 121 



SELF-SUCKING COWS. 



Prevent by putting a halter on the cow with a strong, 

 stiff piece of leather running over the nose. Fill this 

 strip of leather with sharp nails. 



Two per cent coal tar disinfectants are usually used 

 for killing lice. The Oklahoma station recommends a 

 "kerosene emulsion," which is made by using y 2 pound 

 hard soap, 2 gallons of a cheap grade of kerosene and 

 i gallon of water. Cut up the soap and dissolve in hot 

 water; then add the kerosene and thoroughly mix. Be- 

 fore applying to the animals dilute this mixture with 

 7 gallons of water. Apply by means of a sponge, brush, 

 or spray pump. 



WARBLES OR GRUBS. 



These are found just below the skin in the backs of 

 cattle and constitute the larval form of the ox bot-fly 

 or heel-fly. As they develop they cause swellings in 

 the back and are thus easily recognized. Wherever there 

 is a swelling there is also an opening in the skin through 

 which the grubs may be easily squeezed and killed. They 

 may also be destroyed by the application of kerosene. 



