Silkworm co-product after cocoon silkworm is a kind of protein source with higher feed value. After testing, the silkworm cocoon contained 66.85 % protein, 3.08 % lysine, 1.6 % methionine, and tryptophan 0. 68%, except arginine, phenylalanine and isoleucine content is slightly lower than fish meal, the other is similar to fishmeal, but its price is only 1 / 2 of fishmeal.
Although silkworm cocoon is a high-protein, high-fat feed source, it contains 4% - 6% of non-digestible chitin impurities, which must be processed and combined with other protein feeds and vitamins as full-priced feed. The processing method is as follows.
(1) Boiling cleaning method
Dry silkworm cocoons to sieve, remove powder and sediment, grind them with a pulverizer, and then press the mass ratio of cocoons and water to 1 : 4 and add water. Cook for 20 minutes, remove foam and slick oil, and then use cocoon powder. Put it in a cloth bag and rinse it in running water until there are no slicks and foamy impurities.
(2) Soda ash treatment
Prepare a 2% pure alkali solution for use. Add the appropriate amount of blisters to the pulverized silkworm cocoon, then pour the prepared alkaline liquid into it, add a small amount of alum, stir well, precipitate for 24 hours, remove the upper layer of oil and residue, and add a suitable amount of water to the sediment. And alum, stirring, standing, precipitation, when the pH value is 6 and the upper layer of water is clear, remove the precipitated cocoon powder and dry.
(3) Caustic soda treatment
Prepare a caustic soda solution with a concentration of 1.5 %. Put the dried or dried silkworm cocoon into the caustic solution and soak it for about 12 hours. Rinse with clean water to degrease, deodorize, and remove impurities. Then bake. Dry or dried, and then crushed by the grinder is the finished silkworm cocoon powder.
After feeding, the general proportion of feeding silkworm meal to livestock is: 10% to 12% of the total feed is fed to cattle and sheep; 15% to feed pigs; 5% to feed chickens, ducks and geese. 7 % ; feeding lice accounted for 4 % - 5 % ; feeding fish or other aquatic animals accounted for about 2 % .
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