Animal slaughter
The animals most commonly slaughtered for food are cattle and water buffalo for beef and veal , sheep for lamb and mutton , goats for goat meat , pigs for pork , deer for venison , horses for horse meat , poultry ( mainly chickens , turkeys and ducks ) , insects ( a commercial species is the house cricket ) , and increasingly , fish in the aquaculture industry ( fish farming ) . 
<triplet> cattle <subj> beef <obj> this taxon is source of <triplet> goat <subj> goat meat <obj> this taxon is source of <triplet> horse <subj> horse meat <obj> this taxon is source of <triplet> chickens <subj> poultry <obj> subclass of <triplet> ducks <subj> poultry <obj> subclass of <triplet> fish farming <subj> aquaculture <obj> subclass of