the invention relates to a polypeptide for the hydrolytic cleavage of zearalenone and / or at least one zearalenone derivative , said polypeptide being a hydrolase having an amino acid sequence selected from the group consisting of seq id no : 1 - 15 or a functional variant thereof , wherein the sequence of the functional variant is at least 40 % identical to at least one of the amino acid sequences . the invention also relates to : an additive containing the polypeptide ; an isolated polynucleotide that encodes the polypeptide ; and a method for the hydrolytic cleavage of zearalenone and / or of at least one zearalenone derivative using the polypeptide .