12:68:23:03Monitored herd.

A monitored herd is a herd under range conditions on which identification records are maintained for animals over one year of age that are slaughtered and inspected for tuberculosis at an approved state or federal slaughter facility or an approved laboratory. The animals slaughtered have been identified to the herd and the number slaughtered have been evenly distributed over a three-year period, at a rate to detect infection at a two percent prevalence level with ninety-five percent confidence. This rate requires a maximum number of 178 animals. See page 34 in "Bovine Tuberculosis Eradication," USDA, APHIS, January 22, 1999.

Source: 21 SDR 162, effective March 23, 1995; 34 SDR 100, effective October 22, 2007.