Isolated polypeptide that has lysozyme activity, selected from the group consisting of: (a) a polypeptide that has at least 80%, at least 85%, 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 with the mature polypeptide of SEQ ID NO: 4 or the mature polypeptide of SEQ ID NO: 8； (b) a polypeptide encoded by a polynucleotide having at least 80%, at least 85%, 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 with the mature polypeptide coding sequence of SEQ ID NO: 3 or the mature polypeptide coding sequence of SEQ ID NO: 7； (c) a polypeptide encoded by a polynucleotide that hybridizes under very high astringency conditions with the mature polypeptide coding sequence of SEQ ID NO: 3 or SEQ ID NO: 7, or the full length complement of the same； (d) a variant of the mature polypeptide of SEQ ID NO: 4 or SEQ ID NO: 8, comprising a substitution, removal and / or insertion in one or more (eg, different) positions, where the number of substitutions, deletions and / or insertions of amino acids introduced into the mature polypeptide of SEQ ID NO: 8 is not more than 45； 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 que tiene al menos 80%, al menos 85%, al menos 90%, al 5 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 con el polipéptido maduro de SEC ID N.º: 4 o el polipéptido maduro de SEC ID N.º: 8； (b) un polipéptido codificado por un polinucleótido que tiene al menos 80%, al menos 85%, al menos 90%, al menos 91%, al menos 92%, al menos 93%, al menos 94%, al menos 95%, al menos 96%, al meno
