Abstract
Plant tannins are widely found in plants and can be divided into hydrolyzed tannins and condensed tannins. In recent years, researchers have become more and more interested in using tannin-rich plants and plant extracts in ruminant diets to improve the quality of animal products. Some research results show that plant tannins can effectively improve the quality of meat and milk, and enhance the oxidative stability of the product. In this paper, the classification and extraction sources of plant tannins are reviewed, as well as the biological functions of plant tannins in animals. The antioxidant function of plant tannins is discussed, and the influence of their structure on antioxidation is analyzed. The effects of plant tannins against pathogenic bacteria and the mechanism of action are discussed, and the relationship between antibacterial action and antioxidant action is analyzed. The inhibitory effect of plant tannins on many kinds of pathogenic viruses and their action pathways are discussed, as are the antiparasitic properties of plant tannins. The anti-inflammatory action of tannins and its mechanism are analyzed. The function of plant tannins in antidiarrheal action and its influencing factors are discussed. In addition, the effects of plant tannins as feed additives on animals and the influencing factors are reviewed in this paper to provide a reference for further research.
Highlights
Biological Function of Plant Tannin and Its Application in Animal HealthEdited by: Shourong Shi, Poultry Institute, Chinese Academy of Agricultural Sciences (CAAS), China
Plant tannins are polyphenols that are widely found in terrestrial plants and in some marine plants
Tannins were further classified into four major categories according to their chemical structure: gallotannins refer to the combination of galloyl groups or their derivatives with polyols, catechins or triterpenoids; ellagitannins refer to at least two gallic CCs conjugated to each other and catechins conjugated without glycoside; compound tannins refer to glucogenated catechins in addition to gallic tannins or ellagic tannins and condensed tannins mean that C-4 of catechin is linked to C-8 or C-6 of another catechin unit to form oligomer procyanidins and polymeric procyanidins [18]
Summary
Edited by: Shourong Shi, Poultry Institute, Chinese Academy of Agricultural Sciences (CAAS), China. Researchers have become more and more interested in using tannin-rich plants and plant extracts in ruminant diets to improve the quality of animal products. The classification and extraction sources of plant tannins are reviewed, as well as the biological functions of plant tannins in animals. The antioxidant function of plant tannins is discussed, and the influence of their structure on antioxidation is analyzed. The effects of plant tannins against pathogenic bacteria and the mechanism of action are discussed, and the relationship between antibacterial action and antioxidant action is analyzed. The function of plant tannins in antidiarrheal action and its influencing factors are discussed. The effects of plant tannins as feed additives on animals and the influencing factors are reviewed in this paper to provide a reference for further research
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