First Defense WPC90 Bulk Powder - 90 Feeding TubFirst Defense W90 Bulk Powder 90 Feeding Tub Overview: This product is based on the same technology utilized in First Defense Boluses. It consists of dried whey protein concentrate derived from colostrum collected from grade A dairies. This concentrate undergoes a process of concentration and freeze drying to provide a rapid and targeted delivery of globulin proteins to newborn calves. These antibodies specifically bind to and neutralize antigens