Since when did pigs and cows get killed by bullets??

Pig and Cows are being KILLED by bullets and hung alive!! Why do they suffer?? they are animals just like us humans! Pigs are getting shot in the head and put in a machine that steams and take off there Hair, Cows are being skinned alive and like I said hung alive they are eating grain and if you did not that can kill them(!!!) And just because we are hungry and they are meat DOESN'T mean we can just kill them for our satisfaction! Stop this Nonsense Now!!!