PRODUCT DESCRIPTION
Blood meal is a by-product of the slaughtering industry and
is used as a protein source in the diets of livestock.
The drying of whole blood from slaughtered animals derives
blood meal. The method of drying does affect the nutritional
quality of the protein in the meal. The three methods of
processing whole blood are batch dry rendering, ring dried
rendering and spray died rendering.
Batch dry rendering involves the cooking of whole blood in a
jacketed cylindrical cooker that is indirectly heated by steam
at a pressure of about 500 kPa. Ring dried rendering involves
coagulating the blood by steam heating, the coagulum is
centrifuged and dried with hot gas in a ring drier. The process
of manufacturing spray dried blood meal is similar to that of
skim milk powder in which liquid is sprayed inside the warm
chamber and then becomes fine powder instantly.
The ring-dried and spray dried blood meal has a greater
content of total and available amino acids and is of better
nutritional quality. For example, the availability of lysine as
a percentage of the total lysine is 84% to 89% for ring-dried
blood meal, as compared to batch-dried meal in which lysine
is 62% to 77% available.