The absence of trace amounts of natural bioactive compounds with important biological activities in traditional dietary models for global farm animals, coupled with an incomplete theoretical system for animal nutrition, has led to unbalanced and inadequate animal nutrition. This deficiency has adversely impacted animal health and the ecological environment, presenting formidable challenges to the advancement of the swine breeding industry in various countries around the world toward high-quality development. Recently, due to the ban of antibiotics for growth promotion in swine diets, botanical active compounds have been extensively investigated as feed additives. Polyphenols represent a broad group of plant secondary metabolites. They are natural, non-toxic, pollution-free, and highly reproducible compounds that have a wide range of physiological functions, such as antioxidant, anti-inflammatory, immunomodulatory, antiviral, antibacterial, and metabolic activities. Accordingly, polyphenols have been widely studied and used as feed additives in swine production. This review summarizes the structural characteristics, classification, current application situation, general properties of polyphenols, and the latest research advances on their use in swine production. Additionally, the research and application bottlenecks and future development of plant polyphenols in the animal feed industry are reviewed and prospected. This review aims to stimulate the in-depth study of natural plant polyphenols and the research and development of related products in order to promote the green, healthy, and high-quality development of swine production, while also providing ideas for the innovation and development in the theoretical system of animal nutrition.

中文翻译：

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天然植物多酚有助于生态和健康的生猪生产


全球农场动物的传统膳食模型中缺乏微量具有重要生物活性的天然生物活性化合物，加上动物营养理论体系不完整，导致动物营养不均衡和不足。这一缺陷对动物健康和生态环境产生了不利影响，对世界各国养猪业向高质量发展迈进提出了严峻挑战。最近，由于禁止在猪日粮中使用抗生素促进生长，植物活性化合物作为饲料添加剂已被广泛研究。多酚代表了一大类植物次生代谢物。它们是天然、无毒、无污染且高度可重复的化合物，具有广泛的生理功能，如抗氧化、抗炎、免疫调节、抗病毒、抗菌和代谢活性。因此，多酚已被广泛研究并用作生猪生产中的饲料添加剂。本文综述了多酚的结构特点、分类、应用现状、一般特性及其在生猪生产中的应用进展。此外，本文还对植物多酚在动物饲料工业中的研究应用瓶颈和未来发展进行了综述和展望。本文旨在促进对天然植物多酚的深入研究和相关产品的研发，以促进生猪生产的绿色、健康、高质量发展，同时也为动物营养学理论体系的创新发展提供思路。