Do not insist that chickens, ducks, fish, and pigs are born to be eaten by human beings. This is bullying! You should know that even if the creatures you are eating are not your relatives from past lives, they are all Buddhas of the future. They all have the Buddha Nature; it is just that they created negative karma and fell into the animal realm. When their retribution is over and they cultivate the Buddha Way, they will certainly realize Buddhahood in the future.