A controversial topic about the rights of animals

In recent years, there has been much controversy over the cultivating of animals for feeding consumption. In the past, The ancients Our ancestors lived in a harsh environment, fighting against the beasts and hunting for living sustenance. As the cultivation technology developed, our ancestors tended to plough, or even feed some tender (I'm not sure what you mean here?) animals such as pigs and chicken as food resources.
The animal rights folks view the cultivation of animals for food as a brutal behaviour. A large proportion of these people are vegetarian, and they always claim that the animals, even meat pigs have the same rights as humans to live in a free environment, and cannot be killed for pork at will. The domestic animal is also a life living thing, and it has emotions, and should be treated equally.
Conversely, those who consume a lot of meat everyday may think that the dishes made from meat are really tasty. They have spent a lot of time and materials on cultivating these meat farm animals, thereby so treating them as a source of food is reasonable. Another viewpoint is that humans have been are at the top of the food chain, so they can eat what they want to. If the pig lives in the jungle, they will be killed by other big cats such as tigers as well.
In my view, I think the cultivation of tamed animals as edible materials is reasonable, and is just a consequence of competition in the natural world. However, hunting or killing the endangered creatures should be banned, since as they are also invaluable.