Isolated polypeptide having lysozyme activity, selected from the group consisting of: (a) a polypeptide with at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95% , at least 96%, at least 97%, at least 98%, at least 99% or 100% sequence identity to amino acids 20 to 176 of SEQ ID NO: 6； (b) a polypeptide encoded by a polynucleotide with at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99% or 100% sequence identity to the mature polypeptide coding sequence of SEQ ID NO: 5； (c) a polypeptide encoded by a polynucleotide that hybridizes under high or very high astringency conditions with the mature polypeptide coding sequence of SEQ ID No. 5, or the full length complement thereof； (d) a variant of the mature polypeptide of SEQ ID NO: 6, comprising a substitution, deletion, and / or insertion in one or more (for example, different) positions, where the polypeptides differ from no more than 17 amino acids of amino acids 20 to 176 of SEQ ID NO: 6； and (e) a fragment of the polypeptide of (a)； (b), (c) or (d) that has lysozyme activity.Polipéptido aislado que tiene actividad de lisozima, seleccionado del grupo que consiste en: (a) un polipéptido con al menos 90%, al menos 91%, al menos 92%, al menos 93%, al menos 94%, al menos 95%, al menos 96%, al menos 97%, al menos 98%, al menos 99% o 100% de identidad de secuencia a los aminoácidos 20 a 176 de SEQ ID N.º: 6； (b) un polipéptido codificado por un polinucleótido con al menos 90%, al menos 91%, al menos 92%, al menos 93%, al menos 94%, al menos 95%, al menos 96%, al menos 97%, al menos 98%, al menos 99% o 100% identidad de secuencia a la secuencia codificante del polipéptido maduro de SEQ ID N.º: 5； (c) un polipéptido codificado por un polinucleótido que se hibrida bajo condiciones de astringencia altas o muy altas con la secuencia codificante del polipéptido maduro de SEQ ID N.º: 5, o el complemento en toda su
