Of Complex Microbial Inocula Fermented Potato Waste To The Production Of Protein Feed

China is one of the world's largest potato-producing countries. Every year China produces a large number of potato pulp as a result of rapid potato starch production. If the potato pulp is not to be dealed timely and reasonably, it would be a waste of resources and a pollution to the environment. So it will be a contradiction to the sustainable development of China's economy. Therefore it is imperative to explore the timely and reasonable approach of dealing the potato pulp.In this experiment, we use potato pulp as fermentable substrate, chose appropriate accessories, add inorganic nitrogen, and systematically study the change of crude protein content after the fermentation of single or multiple bacterial in order to ascertain the best combination , proportion and number of bacteria; by testing we also ascertain the additive amount of inorganic nitrogen, the best moisture content , fermentation temperature, pH, thickness of fermentable substrate and fermentation time; by L¹⁶(5⁴) orthogonal test, we ascertain the optimizational number of bacteria, fermentation temperature, additive amount of inorganic nitrogen, thickness of fermentable substrate and fermentation time; finally,we make sure that the feeding experiment of pigs can reach to a good feeding effect or not.The experiment results show that the best combination of bacteria to fermentate the potato pulp is Aspergillus niger, Candida tropicalis and Bacillus subtilis, the best proportion is 2:2:1, the best number is 1%, the best additive amount of inorganic nitrogen is 2%. When the thickness of fermentable substrate is 30cm, fermentation temperature is 33℃, pH and moisture content is natural, fermentation time is 48h, the crude protein content after fermentation can reach to the number 13.5%. After the feeding experiment of pigs, the test group is 610.2g, while control group daily gain is 512.6g, so we can make sure that the product can gain weight significantly; the test group's ratio of material to weight is 3.85:1, while the control group is 4.39:1, so we also make sure the product can lower feed conversion ratio; the test group's ratio of input to output is 1:1.45, while the control is 1:1.35,so we also make sure that the product can increase economic efficiency.The experiment process not only solves the problem of agricultural waste and envionmental pollution, but also provide the new type of microbial protein feed. Besides, the technique is simple enough to operate ,while can lower production costs and improve economic efficiency.