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不同氨基酸组成的三肽对南江黄羊体外瘤胃发酵参数的影响

DOI: 10.3969/j.issn.1006-267x.2014.06.033

Keywords: 瘤胃发酵,三肽,微生物蛋白质,氨基酸

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Abstract:

本试验旨在探讨饲粮中添加不同氨基酸组成的三肽对南江黄羊体外瘤胃发酵参数的影响。以4只装有永久性瘤胃瘘管的健康南江黄羊作为瘤胃液供体,采用单因素试验设计,设5个组,对照组采用基础培养底物,试验组在基础培养底物中分别添加2%(干物质基础)的赖氨酸-赖氨酸-赖氨酸(Lys-Lys-Lys)、甘氨酸-甘氨酸-组氨酸(Gly-Gly-His)、蛋氨酸-丙氨酸-丝氨酸(Met-Ala-Ser)、缬氨酸-酪氨酸-缬氨酸(Val-Tyr-Val)4种三肽。培养2、4、8、12、24h后测定培养液pH、氨态氮(NH3-N)和挥发性脂肪酸(VFA)浓度以及微生物蛋白质(MCP)产量。结果表明:除了2h时的Gly-Gly-His组外,各时间点的试验组pH均显著低于对照组(P0.05)以外,Val-Tyr-Val组在各时间点的MCP产量均显著高于其他试验组(P<0.05)。由此可见,饲粮中添加三肽能促进瘤胃微生物的发酵,降低NH3-N浓度以及乙酸/丙酸,提高VFA浓度和MCP产量。本试验条件下,以添加2%的Val-Tyr-Val三肽效果最好。

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