ABSTRACT
Offal or edible and inedible animal by-products comprise a wide variety of products like the skin, blood, bones, meat trimmings and mechanically separated meat, fatty tissues, horns, hoofs, feet and skull, and entrails and internal organs of a butchered animal [1,2]. Depending on cultures and countries, edible by-products may be considered as waste material being thrown away, or as delicacies commanding high prices. Offal not used directly for human or pet food is often processed as material that is used for animal feed, fertilizer, or fuel [3]. The yield of edible by-products depends on species, sex, age, live weight, and others. This yield varies from 10% to 30% for beef, pork and lamb and from 5% to 6% for chicken. Yields of different by-products for different species are shown in Table 1.1.
