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The premature "family planning" of the oxen caused Mo Yan great distress, although she had no choice but to agree. Great Chu did have protections for oxen, but they were not strict. For instance, if an ox fell sick and was not treated, or if it worked to death, the owner would not suffer any punishment.
This led to many people exploiting loopholes, treating oxen like cash cows, renting them out to others during peak farming seasons. As a result, the oxen had endless work every day, and sometimes they couldn't even eat their fill, so they typically had short lives and endured a very tragic existence.
Da Huang, Er Huang, and San Huang had thought of birth control methods, and that was something they had considered.