concentrations of ammeline, ammelide, ureidomelamine
and N-methylmelamine. Pathological findings in cats and
dogs that died from acute renal failure indicated the presence
of crystals in kidney tubules. Infrared microspectroscopy
of individual crystals from the kidneys of cats or rats confirmed
the presence of crystals composed of melamine and
cyanuric acid. Crystals obtained from contaminated gluten
produced comparable spectra. The withdrawal of feed for
domestic animals in connection with acute renal failure in
dogs and cats was originally focused on melamine as the
main suspicious toxic substance. In the course of research
the second toxic compound cyanuric acid was identified
in addition to melamine (Cianciolo et al., 2008). From the
point of view of safety, most reports state that products from
livestock fed by contaminated feed pose only a slight risk to
human beings. Nevertheless, recently melamine was even
found in eggs originating from China, where contaminated
feed is considered as its source. Examples of potentially hazardous
raw materials in feed production are wheat aleurone,
rice flour, corn flour, soya protein and other soya products,
rice pollard, rice protein concentrate etc.