Interesting post. I like the very first diagram most.
I am yet to become a pure vegetarian but have completely given up eating all those big animals like cows, pigs and goats, as the bigger the animal is, most pain it endures before death. We all know how it hurts to bleed and can complain but the poor animal doesn't have that luxury. If you saw that EK article about the Chilaw Kovil sacrifice of animals, it was horrible to see that goat's head gets chopped while one person holds it like a child. In the same pic you see a little girl closing her eyes in disbelief of how inhumane the humans can be.