Abstract: 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.