摘要: 高产奶牛妊娠或分娩后,泌乳启动产奶量增加使机体营养物质需求量增加,同时饲料营养水平供应不足,使机体发生负能量平衡(NEB),逐渐由能量代谢紊乱发展为酮病、糖尿病和脂肪肝等代谢疾病。患病机体平衡能量,增加脂肪、蛋白质和肌肉的代谢,增大机体的负担,损伤代谢器官,干扰内分泌网络,导致奶牛体重降低,产奶量下降,炎症反应增加,免疫能力下降,奶牛不孕,繁殖率降低,严重时还会引发其他疾病。群发性代谢疾病影响奶牛产量,造成奶牛养殖的巨大损失。因此研究奶牛代谢紊乱的发病原因,缓解代谢疾病早期症状,并找到更好的预防和治疗方案是当下研究重点。近年来褪黑素在生产上的应用越来越广泛,随着对褪黑素参与代谢调节,改善代谢紊乱作用机制的研究,褪黑素或许可以作为预防和治疗奶牛代谢紊乱的新途径。本文综述了代谢紊乱引起奶牛酮病和脂肪肝的发病原因,代谢疾病对奶牛生殖功能造成损伤以及褪黑素改善代谢紊乱的作用机理,并对褪黑素在缓解奶牛生产难题的优势作用进行展望。
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