Meat and bone meal production is used in pet food and animal feed, but the risks of mad cow disease make it unsuitable for ruminant feed. Bone meal and meat meal are by-products from slaughterhouses and livestock farms. They can come as separate meals or mixed into meat and bone meal (MBM) which offers more nutrients and increases amino acids in animal feed formulations. But besides feed, MBM can also be used as fertilizer and fuel.
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Meat and bone meal production from by-products of the animal meat industry
Meat and bone meal is a processed by-product of the animal meat industry. MBM is produced mainly from cattle, poultry, and swine slaughterhouse leftovers such as bone, meat, organs, tissues, and fat. It contains protein, minerals such as phosphorus and calcium, and amino acids, contributing to a rich diet for poultry, swine, and sometimes for fish. In fact, it can replace up to 50% of fishmeal in some fish diets.
Meat and bone meal production gives an economical and viable source of nutrients for the animal feed and pet food industry. However, the protein, vitamins, and minerals content varies depending on the quality of the raw material and the proportion of meat, bones, and other organs.
Apply heat treatment for the rendering process
Heat treatment is necessary to avoid spoilage by killing hazardous microorganisms in the raw material that will be transformed into meat and bone meal. The heat treatment in the rendering process can be wet or dry. In the wet process, fat is separated from the other organs when boiling in water. In the dry process, the raw materials go to a steam-jacketed container or cooker, which separates fat with indirect heat. The dry process can be in batch or continuous.
The rendering process to obtain meat and bone meal consists of crushing the flesh, bone, tissues, and organs. Cook the crushed material to separate the fats. Press the mixture to complete the separation of the fats and obtain a protein cake, which is ground into the meal. You can add value to your meat and bone meal if you dry and mill it further. The filtered animal fat can also be used as an animal feed ingredient.
The rendering process is a circular economy solution for the waste generated by the meat industry
Like other meals from the rendering process, making meat and bone meal is a circular economy solution for the waste generated by the meat industry. Slaughterhouses produce millions of tons of animal by-products unsuitable for human consumption, creating an enormous amount of waste that may end in landfills and cause an environmental disaster.
The rendering upcycles meat, bones, blood, feathers, and offal waste, into MBM, blood meal, feather meal, and animal fat, that can be used for animal feed and pet food, as well as for fertilizers. Meanwhile, new studies show that the material can also be used as biofuel.