In the last two decades, the interest in natural plant feed additives (PFA) as alternatives to synthetic vitamins in livestock nutrition has increased. After a systematic review, a total of 19 peer-reviewed papers published between 2000 and 2020 were retained to evaluate the antioxidant effects of PFA compared to synthetic antioxidant vitamins (mainly vitamin E; VitE) in livestock nutrition. These studies demonstrated that PFAs could be as efficient as VitE in counteracting oxidative stress in pigs, rabbits, and ruminants. However, PFAs only positively affected animals’ growth performance and feed efficiency in some monogastric studies. The PFA can affect antioxidant enzyme activity in a dose- and method of administration-dependent manner. The antioxidant capacity of both PFA and VitE were depressed in cows fed with diets rich in polyunsaturated fatty acids. Variability among studies could be related to species differences. Despite the interest of the feed industry sector in PFA, there are still very few studies evaluating their antioxidant effect in species other than poultry.

中文翻译：

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植物饲料添加剂作为合成抗氧化维生素的天然替代品对家畜哺乳动物的性能、健康和氧化状态的影响：过去 20 年的文献综述

在过去的二十年里，人们对天然植物饲料添加剂 (PFA) 作为牲畜营养中合成维生素的替代品的兴趣增加了。经过系统审查，共保留了 2000 年至 2020 年间发表的 19 篇同行评审论文，以评估 PFA 与合成抗氧化维生素（主要是维生素 E；VitE）相比在牲畜营养中的抗氧化作用。这些研究表明，PFA 在对抗猪、兔和反刍动物的氧化应激方面可能与 VitE 一样有效。然而，在一些单胃动物研究中，PFA 仅对动物的生长性能和饲料效率产生积极影响。PFA 可以以剂量和给药方式依赖的方式影响抗氧化酶活性。在饲喂富含多不饱和脂肪酸的日粮的奶牛中，PFA 和 VitE 的抗氧化能力均受到抑制。研究之间的差异可能与物种差异有关。尽管饲料工业部门对 PFA 感兴趣，但仍然很少有研究评估它们在家禽以外的物种中的抗氧化作用。