A microbial adherence inhibitor in the form of fowl egg antibodies is disclosed, along with the method of making it and methods of using it. The inhibitor functions by substantially preventing the attachment or adherence of colony-forming immunogens in the rumen and intestinal tracts of host food animals. The use of antibodies against Fusobacterium necrophorum adherence antigens decreases the colonization of F. necrophorum sufficiently to reduce or eliminate the incidence of liver abscesses in the animals.