NOVELTY - An animal feed is produced by sealing a mixture of feed material and a fermentation agent in an air-tight plastic bag provided with a check valve.    USE - For producing animal feeds.    ADVANTAGE - The conventional method for producing feed costs a great deal for equipments such as a fermenter or a metallic container for fermentation and drying devices and its management, manpower and use of energy. In contrast, by using the air-tight plastic bag, the anaerobic fermentation of feed is performed during storage or transportation while packed in the bag without needing a separate fermentation apparatus, thus investment in equipment and manpower can be greatly reduced. Also, the feed can be produced using readily available material such as grains, stems of crops, grass powder, excrement of domestic animals, or industrial fermentation waste at low cost. Since a plastic bag for product packaging is used as a container for fermentation, a large amount of gas generated by the metabolism of microorganisms during fermentation can be discharged through a check valve and thus, an air-tightly sealed state of the plastic bag can be kept against external impact and pressure. Also, it is possible to prevent the contaminated air of the outside from entering the plastic bag to maintain the environment suitable for the propagation of useful microorganism in the container and thus, to preserve the feed after completion of fermentation for a long period of time. By using a small-sized plastic sealed bag, control of water content can be readily accomplished. The plastic bag serves as a container for product packaging as well as a container for fermentation. Thus, the feed can be directly supplied to animals while wet, without an additional drying process and thus a reduction of active beneficial bacteria and loss of nutritious substances and metabolic substances of microorganisms that occur during drying of the fermentation feed can be prevented and consequently, the effect feed on cattle is increased.    DETAILED DESCRIPTION - Production of an animal feed involves:    (1) culturing bacteria including actinomyces, Deotrichum candidum, cellulose monosaturated bacteria, lactic ferments, phycolmycete, protista, tirchoderma, Saccharomyces cerevisiae, Candida utilis, Aspergillus niger;    (2) drying the cultured bacterial for fermentation and mixing them with sodium chloride, a catalyst and calcium oxide to form a fermentation agent;    (3) mixing feed material comprising grains, stems of crops, grass powder, excrement of domestic animals, industrial fermentation waste or their mixture with the fermentation agent;and    (4) sealing the resulting mixture of the feed material and the fermentation agent in an air-tight plastic bag (1) provided with a check valve (2).    An INDEPENDENT CLAIM is included for a container for fermentation comprising an air-tight bag for receiving a mixture of feed material and a fermentation agent and is provided with a check valve at its side.    DESCRIPTION OF DRAWING(S) - The figure shows a front view of the container for fermentation of animal feed.    Air-tight plastic bag (1)    Check valve (2)