Method for biologically optimizing nutritional value of grape seeds

The invention relates to a method for biologically optimizing nutritional value of grape seeds. Grape seed meal is fermented by a composite microbial method, and the best nitrogen source, best inorganic salt and best addition proportion in the process of fermenting the grape seed meal feed by composite microbial method are determined through screening of single-factor test. The method comprises the following steps: preparing a grape seed meal fermentation culture medium, preparing a fermentation strain amplification culture medium, amplifying fermentation strain and inoculating. Compared with the non-fermented mixture substrate, the content of crude protein in fermentation products can be obviously increased by 59.28%, the content of crude fiber is reduced by 29.16%, and the nutrition utilization value of the grape seed meal is greatly improved; the production performance of livestock and poultry feed can be obviously improved through using the fermentation products, the cost of feed is reduced, and the purpose of more environment protection and high efficiency is achieved. The technology can be widely applied in further development of grape seed meal products and suitable for different feeds for livestock and poultry, and has wide market development prospect.