Abattoir Practices and Animal Products Technology

 VARIOUS METHODS OF TREATING BONES

• The various methods of treating bones while recovering the fat can be summarized as follows:
• Processing under pressure
• In this method the bones with all adhering meat and tendons together with other offals are processed under pressure to obtain bone and other meat meal.
• Boiling bones in open kettle
• In this method all adhering material is freed by dissolving a small part of the ossein.
• The bones are then lifted from the boiling liquid and milled to produce raw bone meal.
• Boiling bones under pressure
• In this method the ossein gets free and this protein is used in meat meal production and milling the bones for steamed bone meal.
• Conserving the ossein for gelatine manufacture
• By subjecting the bones to prolonged cooking in open vats avoid boiling by not exceeding 87.8°C (190°F).
• This results in the loss of the fat while preserving the ossein.
• Such weathered bones may be used for the manufacture of gelatin, raw or steamed bone meal.