Take 5 kilograms of soybeans, soak them in water until they swell, then grind them into a fine paste. Mix the ground soybeans with 10 kilograms of bran to create a uniform mixture. Transfer the mixture into a large tank or barrel, seal the container tightly, and place it in direct sunlight. In summer, allow it to ferment for about 3 days, while in autumn and winter, the fermentation process should last around 7 days. After fermentation, this mixture can be used as a nutritious feed for 20 to 30 kilograms of oysters or 500 chickens (or ducks) over the course of one week. This method is commonly used in small-scale animal farming to enhance the nutritional value of the feed.
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