How did the older generation say not to eat beef on their son's tenth birthday?

Yes, in the past, farming cattle was a strategic material, and people were not allowed to kill cattle. Killing cattle without permission is drunk. Only sick cows can be slaughtered by reporting to the government, so it is difficult for people to eat beef.

There is also a saying that because cows can plow the fields and dogs can look after the house, both of them are human companions, and not eating beef and dog meat belongs to semi-fasting. Belongs to the virtue of accumulating yin.