Abstract: Methionine is the first limiting amino acid for poultry when fed with corn?soybean meal diet. It plays an important role in maintaining the normal growth and laying performance of poultry. However，the research progress of methionine is mainly focused on chickens and few studies are on ducks. So far，the DL ? methionine，methionine hydroxyl analogue and L?methionine are commonly used in poultry. But they are absorbed and transferred in different ways to form L?methionine，and the efficiency is different. Methionine and its hydroxy analogues are absorbed through the front end of digestive tract，duodenum or ileum，and L ? methionine is produced by rate ? limiting enzymes andtransaminases. They participate in a variety of metabolic pathways in liver and other tissues，promote protein synthesis，provide methyl donors for methionine cycle，and improve antioxidant properties. Therefore，this article summarized the function of methionine and its application in ducks，including the apparent digestibility of methionine in duck，the optimal requirement and bioefficiency between resources in meat ? and egg ? ducks，in order to provide scientific basis for the application of methionine in duck production.

Key words: Methionine, Source, Duck, Requirement, Efficacy

摘要： 蛋氨酸是饲喂玉米?豆粕型饲粮家禽的第一限制性氨基酸，对于维持家禽正常的生 长和生产具有重要作用，但蛋氨酸在家禽研究和生产中的应用主要集中于鸡，在鸭的报道较 少。常用的蛋氨酸源主要有DL?蛋氨酸、蛋氨酸羟基类似物、L?蛋氨酸等。不同蛋氨酸来源在 体内的吸收转化不同，发挥的作用效果也不同。D?蛋氨酸和蛋氨酸羟基类似物需经消化道前 端、十二指肠或回肠吸收，在限速酶、转氨酶等作用下生成L?蛋氨酸，然后再在肝脏等组织中 参与代谢，促进蛋白质的合成，为蛋氨酸循环提供甲基供体，发挥抗氧化功能等。因此，该文 总结了蛋氨酸的代谢、在鸭中的生物学功能及其在生产中的应用研究，包括蛋氨酸在鸭中的表 观消化率、蛋氨酸及其不同来源在肉鸭和蛋鸭中的最适需要量及相对生物学效价研究，以期为 蛋氨酸及其不同来源在鸭生产中的合理应用提供科学依据。

关键词: 蛋氨酸, 来源, 鸭, 需要量, 相对生物学效价