1. Efficiency: It is estimated that 90% of food energy is defecated. Cows, chickens & pigs survive off of plentiful green vegetation. Carnivores need meat, so you would need to breed a lot of cows/chickens, naturally loosing 90% of the food product you invest on them to eat, but THEN you would loose another 90% when you feed the cows and chickens to the lion! What this means is that for 100lbs of corn that you feed a chicken, you get 10lbs of chicken meat, and then you give that 10lbs of chicken meat to a lion and only get 1lbs of lion meat! So essentially 100lbs of cord for just 1lbs of lion meat.
2. Taste: Best tasting meat on land comes from herbivores. Cattle that eat grasses and corn have acquired a taste for homosapien. Carnivores tend to have rough hard meat [because they have to chase/hunt prey]. Taste is also not pleasant. From my personal experience; my fathers friend made some rice with eagle meat, typically we use chicken but he tried eagle, a bird of prey that survives off eating other animals. It was gross.
3. Practicality: Elephants eat vegetation so why don't we eat them? With only 1 offspring per 2-5 years, it is very difficult to mass breed them. You need to mass breed to efficiently cattle. Early humans did hunt wolly mammoths, wolly rhinos and bison. Result was wolly mammoths and rhinos went extinct, and bison almost did but luckily they can mass breed in nature.
4. Ease to domesticate: Only some fish can be eaten by man in an industrial level without going extinct. Once men began farming, the nomad lifestyle ended and we no longer wanted to have to go for a hunt to get meat. We could only domesticate certain animals.
Cows came from wild aurochs, because wild aurochs are not as aggressive and territorial as buffalo or bison. It was easier to domesticate.
Feral chickens were practical, they were small birds who could not efficiently fly, ate pretty much anything and were not aggressive, their survival tactic was to flee.
Pigs originate from Eurasian wild boar, which are one of the least aggressive boar species, have small tusk and are large [plenty of meat]. Also eat pretty much anything.
Big dangerous animals which are picky eaters aren't practical cattle.