The sheep pen is relatively easy to set up; only the rams have to be raised separately, otherwise they'll fight. Later, when building a pigsty, there also needs to be a pool with running water for easy washing and to keep things sanitary.
If they raise chickens, they'll have to clip their beaks, otherwise the chickens will peck at each other and fight, even peck at the anus and pull the intestines out. Chicks are weak, once injured they'll definitely die.
Once there's more livestock, the manure can be used to make fertilizer to enrich the fields. In this era there are no breeding farms; manure fertilizer has to be bought, and even one shoulder-load costs a Copper Coin.
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For other people, getting cement is incredibly difficult. Yin Shuangshuang only had to send up a secret memorial, and the Emperor immediately had a trusted aide deliver a huge batch of cement and told Yin Shuangshuang to use it as she pleased.
