. Activities handbook. Veterinary medicine. 4 percent of the dairy herds suspicious to the niilk-rinjr test, and almost all testing? of nega- tive dairy herds was thereby eliminated. A very significant part of the brucellosis eradication program is the testing of market cattle at concentration points and abattoirs. This procedure, adopted widely during 1960, is proving particularly effective in screening beef herds, and for evaluating range and semirange areas for recertification. It is novi' being used extensively in a number of Western States, and has been adopted in some of the Eastern Stat
. Activities handbook. Veterinary medicine. 4 percent of the dairy herds suspicious to the niilk-rinjr test, and almost all testing? of nega- tive dairy herds was thereby eliminated. A very significant part of the brucellosis eradication program is the testing of market cattle at concentration points and abattoirs. This procedure, adopted widely during 1960, is proving particularly effective in screening beef herds, and for evaluating range and semirange areas for recertification. It is novi' being used extensively in a number of Western States, and has been adopted in some of the Eastern States as well. Under the market cattle testing pro- gram, animals are identified by a uniform back tag applied at ranches, farms, or markets. Blood samples are taken from these animals at time of slaughter or sale and forwarded to central laboratories along with the animal iden- tification numbers. The results of negative tests are credited back to the areas from which the cattle originated, and herds from which in- fected animals came are blood tested. MARKET CATTLE TESTING Cooptfohye Slatt ftdtral Brucellofii Erodico'.on Progi Tagging Testing NO Of STATES. 1959 1960 1959 1960 aOmcULTUR*!. RESEARCH SERVICE Evolution of the program Participation through the years has gradu- ally changed from individual-herd plans de- signed to meet varying conditions, to compul- sory area programs, usually on a countywide basis, for complete elimination of the disease. When, as a result of a test of all herds, the in- cidence of brucellosis is reduced to not more than 1 percent of the cattle in not more than 5 percent of the herds, the area is designated a modified-certified brucellosis area. By June 30, 1960, 24 States plus Puerto Rico and the Virgin Islands had been so designated. In addition, there were more than 800 modified-certified brucellosis area counties in 24 of the remaining 26 States. With almost 800 counties working toward initial certification, approximately 72 I)ercent of the Natio
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