有一組稱為防禦素的先天性多功能蛋白質,亦能有力對抗感染。這些蛋白質的含量通常在初乳中最為豐富,之後就會逐步減少。防禦素中其中一種含量最高的是乳鐵蛋白:一種與鐵結合的蛋白質,是運鐵蛋白家族的成員[21],[22],能有效對抗多種細菌、病毒、真菌的感染[23],[24],[25],[26],[27]。
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