A cargo of Argentine corn purchased by Brazilian poultry and pig farms tested positive for genetically modified (GM) material and may not enter Brazil, the Agriculture Ministry said last week. Last week, ministry analysts tested samples taken from the 38,000-ton cargo, originally shipped by the Uruguayan subsidiary of private U.S. grain giant Cargill, and detected certain proteins that prove transgenic alteration. The vessel carrying the corn was not permitted to unload its cargo at the northern Brazilian port of Recife, capital of Pernambuco state, and has been lying offshore while the government team conducted its DNA tests over a number of days.