First Defense Bolus 5-pkg
Prepared from hyperimmune bovine colostrum, First Defense® is a bolus which dissolves readily upon reaching the calf's stomach, providing protective levels of antibodies to potential sites of intestinal infection. These highly specific antibodies serve to block enterotoxigenic E. coli adherence and interfere with coronavirus infection of intestinal epithelial cells, thereby reducing scours related morbidity and mortality. First Defense® delivers preformed immunity and immediate protection when calves need it most. Maximal protection is achieved when administered in the first 12 hours after birth and used in conjunction with good colostrum feeding and calf nutrition programs.