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首页> 外文期刊>Small Ruminant Research >Amino acid profile of the protein from whole saliva of goats and sheep and its interaction with tannic acid and tannins extracted from the fodder of tropical plants
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Amino acid profile of the protein from whole saliva of goats and sheep and its interaction with tannic acid and tannins extracted from the fodder of tropical plants

机译：山羊和绵羊全唾液中蛋白质的氨基酸特征及其与热带植物饲料中鞣酸和单宁的相互作用

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The foraging response of goats and sheep to tannin-rich plants (TRP) could be influenced by their physiological adaptation to eat fodder from a specific ecological niche. The aims of this study were: (1) to describe the amino acid profile of the protein from whole saliva of adult goats and hair sheep browsing/grazing native vegetation, (2) to measure the interaction of whole saliva from goats and hair sheep with tannic acid, (3) to compare the tannin-binding capacity of lyophilized whole saliva from goats and sheep to precipitate tannins extracted from the fodder of tropical TRP (Acacia pennatula, Lysiloma latisiliquum, Leucaena leucocephala and Piscidia piscipula). Fresh whole saliva was obtained from 42 adult goats and 51 adult hair sheep. A second batch of saliva (obtained from 75 adult goats and 93 adult hair sheep) was lyophilized whole saliva. Protein from whole saliva in both animal species had a similar pattern of amino acid composition. Histidine and arginine were found, accounting for 30% and 24% of the amino acid content, respectively. Whole saliva from goats and sheep showed a linear dose response to increasing concentrations of tannic acid at each time point measured (P<0.001). Saliva from goats was able to precipitate higher quantities of TRP extracts from A. pennatula and L. latisiliquum than from P. piscipula and L. leucocephala (P < 0.05). Saliva from sheep precipitated higher quantities of L latisiliquum and P. piscipula extracts (P<0.01). Also, salivary proteins from goats had higher capacity to precipitate tannins from A. pennatula than sheep, while salivary protein from sheep had higher capacity to precipitate tannins from P. piscipula than goats (P<0.05). The results provide evidence of the differences between goats and sheep in the capacity of their saliva to interact with local sources of tannins, which could explain the different feeding behaviour of goats and sheep. The presence of histatins may help to explain the in vivo AH effects of TRP fodder
机译：山羊和绵羊对单宁含量高的植物（TRP）的觅食反应可能受其对特定生态位的饲料采食的生理适应性影响。这项研究的目的是：（1）描述成年山羊和有毛绵羊浏览/放牧本地植被的全唾液中蛋白质的氨基酸谱，（2）测量山羊和有毛绵羊的唾液与水的相互作用。单宁酸（3）比较从山羊和绵羊冻干的整个唾液中单宁的结合能力，以沉淀从热带TRP（金合欢，阔叶枸杞，白叶白头翁和Piscidia piscipula）饲料中提取的单宁。新鲜的全唾液是从42只成年山羊和51只成年羊身上获得的。将第二批唾液（从75只成年山羊和93只成年毛羊那里获得）冻干整个唾液。两种动物全唾液中的蛋白质具有相似的氨基酸组成模式。发现组氨酸和精氨酸分别占氨基酸含量的30％和24％。在每个测量的时间点，山羊和绵羊的全唾液对单宁酸浓度的增加表现出线性剂量响应（P <0.001）。来自山羊的唾液能够沉淀出比假单胞菌和白头翁假单胞菌更大的A. pennatula和L. latisiliquum TRP提取物（P <0.05）。绵羊的唾液中沉淀出更多的阔叶乳杆菌和恶臭假单胞菌提取物（P <0.01）。同样，来自山羊的唾液蛋白比来自绵羊的唾液中单宁酸的沉淀能力更高，而来自绵羊的唾液蛋白比来自山羊P的唾液蛋白中的丹宁酸沉淀的能力更高（P <0.05）。结果提供了山羊和绵羊在唾液与局部单宁来源相互作用能力上的差异的证据，这可以解释山羊和绵羊的不同喂养行为。组蛋白的存在可能有助于解释TRP饲料在体内的AH效应

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