“…A condition designated ''gizzard erosions'' and/or ''gizzard ulceration'' (GEU) has been reported in commercial broiler chickens in connection with avian adenovirus infection (Ono et al ., 2001(Ono et al ., , 2003a, mycotoxin-contaminated feed (Hedman et al ., 1995;Hoerr, 2003), vitamin B 6 deficiency (Daghir & Haddad, 1981), suboptimal levels of vitamin E (Janssen & Germs, 1973), inadequate levels of sulphur-containing dietary amino acids (Miller et al ., 1975), high levels of dietary copper (Poupoulis & Jensen, 1976), pelleted feed (Ross, 1979), as well as inclusion of certain fish meals in the diets and the consequent presence of histamine and gizzerosine (Harry & Tucker, 1976;Okazaki et al ., 1983;Sugahara et al , 1988;Sharma & Pandey, 1990;Tisljar et al , 2002). The koilin layer of gizzards from affected birds is fissured, thickened, spongy and discoloured (Fossum et al ., 1988).…”