On the basis of ensuring other nutrients, adding 8% of sand to the compound feed has the best effect. The chicken has the most appetite, the best mental and physical condition, and the highest egg production rate. When the amount of sand added was less than 8%, the chicken's egg production rate did not increase significantly. When the amount of sand added was more than 8%, the chicken's egg production rate decreased. This shows that the higher the proportion of sand, the lower the egg production and the bad mental state.
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