Chicken and duck farmers can use this method: take 5 kg of soybeans, soak them in swell and refine, and mix them with 10 kg of bran into a paste, and put them into a tank or barrel for fermentation. The mouth should be closed and exposed to the sun, 3 days in summer, 1 week in autumn and winter, 20 to 30 kilograms of fresh oysters, and 500 chickens (ducks) for 1 week.
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