Feed Lot

NOV 2017

Feedlots and cow/calf operations in the beef industry who feed 500 or more has annually on grains and concentrates; maintain 500 or more beef cows; backgrounder, stocker/grower, preconditioner; veterinarian, nutritionist, consultant

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against respiratory viruses are known to respond faster and better to antibiotic therapy if needed. A good environment with plenty of shade, space, clean water and bunk s pace reduces stress. Identification a nd removal of PI calves is accom- plished through a simple, inexpen- sive ear notch skin test. Trace min- eral deficiencies can be addressed quickly through an injectable trace mineral supplement while calves are transitioning on to a trace min- eral mix. Treatment failure due to human errors may include poor timing, use of the wrong drug, improper dose or route of administration, mishandling issues or failure to recognize treatment response. Timing is crucial; if calves are treated early in the course of dis- ease, almost any antibiotic will work. Conversely, if calves are treated late in the course of the disease, nothing will work. In addition to timing, dosage is cru- cial because antibiotics only work if they reach concentrations above the minimum inhibitory concen- tration or "MIC". Figure 1 graphi- cally displays the difference FEED•LOT  November 2017 11 Figure 1: The "MIC" is the "minimum inhibitory concentration" or the minimum level of the drug needed to fight bacteria. u

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