What is the formula for gaining weight on the day of killing pigs?

"Four or six don't break the circle, seven is the birthday of the pig".

It means that you can't kill pigs on the days when there are four, six and seven numbers in the lunar calendar, that is, the nine days of each month, namely April, June, July, 14, 16, 17, 24, 26 and 27.

Why do you say "four or six don't break the circle":

Why can't you kill pigs every four days? Because it is not conducive to using this pigsty to raise pigs in the future, it is necessary to choose another place to build a pigsty, because if this pigsty raises pigs again, pigs may get sick and die.

The main reason is that "four" and "death" are homophonic, so it is unlucky to kill a pig for four days.

Why can't I kill pigs on the day of sewing 6? Because 6 is a very auspicious number, which means smooth.

If you kill pigs on the sixth day of sewing, then use this pigsty to raise pigs in the future, which is not conducive to the growth of pigs. Pigs are prone to illness and will be very unhappy.