|This article does not cite any references or sources. (December
2008)| Rendering is a process that converts waste animal tissue
into stable, value-added materials. Rendering can refer to any
processing of animal products into more useful materials, or
more narrowly to the rendering of whole animal fatty tissue into
purified fats like lard or tallow. Rendering can be carried out
on an industrial, farm, or kitchen scale. The majority of tissue
processed comes from slaughterhouses, but also includes
restaurant grease and butcher shop trimmings, expired meat from
grocery stores, and the carcasses of euthanized and dead animals
from animal shelters, zoos and veterinarians. This material can
include the fatty tissue, bones, and offal, as well as entire
carcasses of animals condemned at slaughterhouses, and those
that have died on farms, in transit, etc. The most common animal
sources are beef, pork, sheep, and poultry. The rendering
process simultaneously dries the material and separates the fat
from the bone and