Department of Animal Science


Date of this Version



2018 Nebraska Beef Cattle Report. University of Nebraska Extension MP105. Lincoln, NE.


© 2017 The Board Regents of the University of Nebraska.


A feedlot study was conducted comparing a natural feed additive (Ramaekers Immune Primer) to Tylan or nothing on receiving and finishing performance. There were no differences for final BW, ADG, F:G, HCW, marbling, LM area, or fat thickness due to treatment. Liver abscess incidence and severity were reduced in steers fed Tylan, no differences were noted between Ramaekers Immune Primer and no additive. There was no difference in number of cattle treated for respiratory illness. Steers on the Ramaekers Immune Primer treatment had lower feed intake during the receiving period but had similar ADG and numerically better F:G at day 19 compared the control. These results suggest Ramaekers Immune Primer may be more beneficial, leading to increased performance, for younger, naive calves during the receiving phase.