Can't you eat beef in the Ming Dynasty?

You can't eat beef in the Ming Dynasty.

The Ming and Qing dynasties stipulated that those who slaughtered cattle should be beaten with a hundred canes, sentenced to one and a half years, and exiled for a thousand miles.

So, what about the old plowing oxen? According to the information, if more cows are old and can no longer do the work, they need to be declared to the official, after which they can be slaughtered.