God needs an emperor, and the old man has a crush on the big landlord Zhang Bairen. It is said that he is capable (but he is not). When Laojun Raber became the Jade Emperor, he took his chicken and dog with him. As it happens, the pig of Bairen's family went out for a walk and missed the fairy. There will be no pigs in heaven. The jade emperor likes to eat pork, but there is no pork to eat, so the people bribed the jade emperor with pigs as sacrifices to please him.

2. Why use a pig's head?

The pig's head is cheap, and the people are very poor, so we have to use it to make up the number. Later it became a custom.