You are missing the point. Farm animals of all unique kinds only exist because they are food. These animals exist because the economic return of them. There are millions of farm animals that would simply die or go extinct if the economic demand for them disappeared. Vegans call for the end of animals as meat. Ok. Then what do you do with all the animals? Let them die?

Big farms are a problem but plantations are even worse than animal farms because they extract a lot from the soil, animals extract but give back a lot as feces. Small family farms are great for the environment and need zero external fertilizers and the animal feces create a healthy equilibrium and that's impossible to obtain with only plants

Veganism is a failed moral philosophy. More animals die from avoiding an obvious food choice we were evolved to consume than by their actual consumption. It's unfortunate that we were born into the life/death cycle, but attempting avoid it will only make it worse.