How does the animal farm know the feed demand?

For example:

Pigs: Each pig needs about 300kg of feed from piglet to slaughter;

Chicken: Calculated by inventory, each chicken needs 0.125kg of feed per day;

Cattle: Calculated by concentrated feed, a cow is 6kg a day, 6kg*1000 cows=6000kg, and the production time is 10 hours a day, and the output is 600kg per hour.

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