Initial reports of pet food containing Wheat Gluten (a source of protein intentially added to products to make them appear higher in protein). Apparently due to mis-labeling, U.S. inspectors say that material contaminated with melamine was actually wheat flour.
Wheat GLUTEN -
CORN GLUTEN -
Tainted corn gluten was originally found in South Africa.
Tests confirmed that "Vets Choice" and
"Royal Canin" dog and cat dry pet-food products contained corn
gluten contaminated with melamine. The
contaminated corn gluten appeared to orginate in China, delivered by a South
African third-party supplier. The products were exclusively
sold in South Africa and Namibia. North American began looking
into corn gluten and eventually began recalling products that
contained corn gluten.
Pet Food Recall Expansion: More Melamine Found In Pet Food (April 25)
'Don't dump pet food' (April 21)
Dozens of South African dogs die from contaminated pet food
CONCENTRATE - In April a pet vood company voluntarily
recalled its products believing its rice protein concentrate was
contaminated. The supplier, Wilbur-Ellis, urged
manufacturers using rice protein concentrate in
their pet food to recall their products.