The external, non-human factor that determined the daily activities of Serfs is that they must raised vegetables and herbs and they work on lord's field.
It should be noted that serfs are usually tend to their lord's fields, and they also had their own chores to do while they raise the vegetables and herbs, they do help to fattened a pig.
However they entitled to protection, justice, as well as the right to cultivate certain field so as to be able to maintain their own subsistence, hence external, non-human factor that determined the daily activities of Serfs is that they must raised vegetables and herbs and they work on lord's field.
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