USES ENUMERATED

Timaru Herald, Volume CXLIII, Issue 20809, 18 August 1937, Page 3

USES ENUMERATED

MEATWORKS BY-PRODUCTS Meatworks by-products are all of organic origin, and vary in composition with the part or parts of the animal used in their preparation. Blood is used either as a foodstuff (blood meal) or as a fertiliser (dried blood), depending on the quality of the manufactured product. Dried blood contains 81 per cent, crude protein (nitrogen 13 per cent.), and other organic matter, plus moisture 19 per cent. It is a widely used nitrogenous fertiliser, comparable in many respects with sulphate of ammonia in the rapidity with which the nitrogen is available to the plant. Bone is finely ground in the preparation of bone flour, bone meal, and bonedust. An average quality bonedust contains crude protein 22 per cent. (35 per cent, of nitrogen), tricalcic phosphate 50 per cent. (23 per cent, phosphoric acid), and other organic matter, plus moisture, 28 per cent. Bonedust is a slow-acting phosphatic manure. The more highly-refined products find an outlet as a constituent in many stock licks, which are valuable for stock grazing on phosphate deficient soils. Waste flesh is the basis of meat meal, the dried residues being finely ground. It invariably contains a certain amount of bone. Meat meal (crude protein 63 per cent.), like blood meal, is an excellent protein concentrate for stock. It also contains fat. When used for fertilizer purposes the fat is first extracted during preparation. Meatworks manure is a mixed product containing blood, bone and waste flesh. It contains approximately 6 to 3 per cent, nitrogen and 14 to 23 per cent, phosphoric acid, and is widely used. It should be noted that as the nitrogen increases the phosphoris acid decreases, and vice versa. All bone flour, bone meal and meat meal products used for feeding animals must be subjected to a steam heat at a temperature of not less than 250 degrees Fahrenheit, equal to an indicated steam pressure of 301 b, a square inch for at least two hours during the manufacturing process. They must be prepared only from animals slaughtered for human consumption.