Research progress on vegetable tannins and its effect on animals
This article summarized the content of vegetable tannins,the impact of tannins on plants and ani reals, and the approaches to reduce the content of tannins. Vegetable tannins are common polyphenolic in plants and it is self-protective substances derived from the carbohydrate metabolism in plant evolution. There are two types of tannins in vascular plants, hydrolysis tannin and condensed tannin. The content of vegetable tannins is concerned with genes,location, growth stage, and diseases of plant. The impacts of tannins on animals are in many aspects, high content tannins can protect the plant from herbivore and appropriate content tannins can re- duce animal bloat. There are many ways to reduce the content of vegetable tannins.