Flies are more than just an annoyance for calves in warm weather. High fly populations also can spread diseases among calves; cause stress and reduced immunity; and negatively impact growth and weight gain.
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.
AgDay's Betsy Jibben had a discussion with one of the panelists, Dr. Jan Shearer, a Professor and Extension Veterinarian at the College of Veterinary Medicine at Iowa State University to break it down scene by scene.