Dan’s Cow-Calf Corner Most Passive Immunity Occurs in the First 6 Hours

Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist — Resistance to disease is greatly dependent on antibodies or immunoglobulins and can be either active or passive in origin. In active immunity, the body produces antibodies in response to infection or vaccination. Passive immunity gives temporary protection by transfer of certain immune substances from resistant individuals. An example of passive immunity is passing of antibodies from dam to calf via the colostrum (first milk after calving). This transfer only occurs during the first few hours following birth. Research is indicating that successful transfer of passive immunity (the first day of…

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