Ye Liuyun was far more influential than Dong Tianyu had imagined. Though Dong Tianyu was a reborn man supported by the System, he still viewed the world through the lens of his past experience, even as he began his cultivation.
Before his rebirth, Dong Tianyu was just an ordinary survivor, ignorant of many things. To the higher-status survivors, meat and fresh vegetables were rare but not unheard of like they had been for Dong Tianyu.
Despite experiencing the Cold Catastrophe and the flood, some things had been preserved. Perhaps the Officials retained them to maintain biological diversity, or for other reasons, but common livestock such as chickens, ducks, geese, cattle, and sheep were indeed being raised by the Officials. While the quantities were small, they ensured these species didn't become extinct in this era of disaster.