Grape seed is a by-product of wine making or grape seed oil pressing.The effective utilization of grape seed in animal production can not only improve the antioxidant capacity of livestock and poultry,but also contribute to the rational and effective utilization of resources.As a kind of unconventional feed material,grape seed has low crude protein content,high fiber content,and a large amount of polyphenols,linoleic acid,amino acids and some vitamins and minerals.In this paper,the nutritional characteristics,biological functions and application effects of grape seeds in different animals were...