水禽分子营养研究进展
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摘要
水禽产业已成为农业产业中的重要产业,水禽营养的相关研究工作取得了一系列突破性进展,但分子营养方面研究还比较薄弱,近些年的相关研究主要集中在早期营养调控方面。研究表明早期发育占据家禽整个生命周期中较大比例,孵化后期是水禽胚胎消化器官和肌肉组织发育的重要阶段,其发育的快慢决定着出壳后的生长性能。当孵化后期家禽消化器官快速发育及机体活动加快时,蛋中所能提供的能量不能满足其需求,进而需要动员骨骼肌提供氨基酸底物作为糖异生来源,参与骨骼肌中蛋白质分解代谢的途径主要有泛素途径和溶酶体途径。近年来的研究表明,孵化后期家禽胚胎能量紧缺后能量贮存发生动员,机体通过泛素蛋白酶体途径和溶酶体途径介导胸肌中蛋白质降解供能。通过孵化后期二糖(蔗糖+麦芽糖)和丙胺酰-谷氨酰胺的补充有利于胚胎机体能量贮存,同时对出壳后早期能量状态产生有利影响,进一步研究发现孵化后期能量贮存动员加快,能量的紧缺很可能抑制了骨骼肌中蛋白质的翻译起始,同时加快了泛素系统参与的蛋白质分解代谢,进而导致骨骼肌的负生长。当对孵化后期进行单独补充二糖或丙胺酰-谷氨酰胺时,可以缓解泛素系统所参与的蛋白质分解代谢,促进肉鸭骨骼肌早期生长。但目前的研究中发现胚胎期营养对小肠发育、骨骼肌生长以及肉鸭出壳后生长的影响仅限于出壳后很短时间,其时间效应性是否跟所提供的营养物质剂量有关,这些问题有待于进一步研究和证实。
引文
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