slble the frequent, comparatively low-cost 

 screening of commercial dairy herds. Milk 

 samples from dairy herds are obtained at the 

 milk-processing plants and tested in central 

 laboratories. Suspicious reactions are related 

 to the herds from which the samples were 



taken, and the cattle in those herds are then 

 blood tested to identify the infected animals. 

 Less than 4 percent of the milk samples proved 

 suspicious during 19G0. This compares with 

 26 percent in 1954. Dairy cattle blood-testing 

 activities during 1960 were concentrated in the 



liN 39275 



Back tag being applied tu cow in market cattle testing program. Cattle bearing these identification tags are blood 



tested for brucellosis at concentration points and abattoirs. 



