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Rendering is a process that converts waste animal tissue into stable, usable 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 .
Animal glue in granules. Animal glue is an adhesive that is created by prolonged boiling of animal connective tissue in a process called rendering. [1] In addition to being used as an adhesive, it is used for coating and sizing, in decorative composition ornaments, and as a clarifying agent.
With gas stunning animals are exposed to a mixture of breathing gases (argon and nitrogen for example) that produce unconsciousness or death through hypoxia or asphyxia. Carbon dioxide is the main gas used today. The process is not instantaneous, with reported signs of severe distress before respiratory failure when done with carbon dioxide. [6]
Meat and bone meal. Meat and bone meal (MBM) is a product of the rendering industry. It is typically about 48–52% protein, 33–35% ash, 8–12% fat, and 4–7% water.It is primarily used in the formulation of animal feed to improve the amino acid profile of the feed.
Feather meal is used in formulated animal feed and in organic fertilizer. Worldwide, approximately 50 billion chickens were used for human consumption in 2014. [1] Feather meal is made through a process called rendering. Steam pressure cookers with temperatures over 140 °C (284 °F) are used to "cook" and sterilize the feathers.
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This rendering process not only separates fat and removes water to create a concentrated protein product, it also kills bacteria, viruses, parasites and other organisms. Because meat can be rid of infectious agents through the rendering process, “4D” animals (dead, dying, diseased or disabled) are allowable chicken meal ingredients.
Tallow made by rendering calf suet. Tallow is a rendered form of beef or mutton suet, primarily made up of triglycerides. In industry, tallow is not strictly defined as beef or mutton suet. In this context, tallow is animal fat that conforms to certain technical criteria, including its melting point.