Cow Discards Loaded into Rendering Truck

Do you know what "rendering" is?

Rendering is the process that converts "waste animal tissue" (heads, legs, hoofs, fats, and bone) into both "edible" and inedible materials. 

Right now, this truck is driving the cow's remains to the rendering plant where they will take these "edible fat materials" and heat them with steam then separate the fat from the bone with boiling water. The final product that these animals have been reduced to will be used in human food products and pet foods.