First, wash the bones of livestock and poultry and dry them, chop them into small pieces, and put them in a pot. Add appropriate amount of vinegar and tightly cover them. Use low-temperature decoction until the bones are tender and soft, remove them and dry them, wash them and sieve them to form bone meal. Second, the livestock and poultry bones washed into the pot, add boiling water for about 60 minutes, remove and dry, and then mix with the fine sand into the pan, fry for 20 minutes until the bones are removed yellow, crushed and sieved into bone meal. Third, the bones are smashed into the tank or in the pit, a layer of bone and ash, lime, water, sealed, often adding water, keep moist, after 3-4 months, under the action of alkali solution, The bones become loose, remove and wash and dry, grind the sieve and serve. Bone meal generally contains 20-30% calcium and 10-14% phosphorus. It is a high-quality calcium-phosphorus supplementary feed, and bone meal accounts for 1-3% of the diet.
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