Modified live vaccines can be effective in building immunity in cattle, because they stimulate an immune response to a variation of disease-causing organisms. But those live organisms can be touchy and temperamental.
Parts of Iosco and Ogemaw counties in Michigan have been designated by officials as a “Potential High-Risk Area” for bovine tuberculosis after a white-tailed deer in Alcona County tested positive for the disease.
Grass tetany might be easily defined as a deficiency of magnesium, but for Dick Kurtz of Oregon, Mo., it just means trouble. He lost three cows in March to the disorder and is carefully watching a few more.