DDGS-related Q&A Exchange (Issue 01)
Some Q&A on DDGS 01
Q: What is the difference between DDGS and DDS? Is there a most cost-saving production process? How much does the energy value differ between DDG and DDGS? A: DDG: obtained by drying the solids portion of the distillation waste liquid, bright in color. DDS: obtained by concentrating and drying the residual liquid after the solids portion has been removed. DDGS: a product made by mixing DDG and DDS, a dark-colored distillers grain. Modern fermentation technology, differential-pressure rectification technology, low-temperature drying technology, etc. are used in new fuel ethanol plants. For example, corn deep processing can be divided into the whole-grain method, the wet method and the dry method. The drying process has high economic cost; without an evaporation and concentration unit, DDS cannot be recovered, and directly using wet-grain DDG for local animal farms can save costs. Products from different manufacturers, or products from the same manufacturer, vary greatly in quality. Generally the energy value difference between DDGS and DDG is not great: for example, digestible energy: DDG, 14.35MJ/KG; DDGS, 13.10MJ/KG (pigs)
Q: What is the sulfur content in DDGS? A: Sulfuric acid is added to adjust the pH value, and the amount added varies among manufacturers. The sulfur content in corn DDGS is 0.34%-1.05%. Q: What about the variation in lysine in DDGS? A: DDGS is deficient in lysine and tryptophan, and the variation is also great. Lysine averages 0.89%, range: 0.61-1.06%. Q: When the backfill ratio of DDS in DDGS differs, how do the nutritional components change? A: The higher the backfill ratio of DDS, the lower the protein content, the higher the fat content, and the phosphorus content also increases. For example, a DDGS product with DDG/DDS (60/40): crude protein 28.2%, crude fat 10.0%, P 0.81%; for example, a DDGS product with DDG/DDS (80/20): crude protein 31.4%, crude fat 8.6%, P 0.68%. Q: What effects do by-products such as DDGS have on animal growth and health, and how can they be prevented? A: When using such by-products, one must grasp the exact nutritional composition, advantages and disadvantages of the by-products. In addition, regarding animal health, attention should be paid to: 1)
Mycotoxin problem: by-products have high moisture content and the grain is already damaged, so mold grows easily; therefore the mycotoxin content is very high, and multiple mycotoxins may be present, causing mycotoxicosis in livestock. This leads to low immunity and susceptibility to disease, and decreased production performance. Therefore mold inhibitors and broad-spectrum mycotoxin adsorbents must be used. 2)
Because the proportion of unsaturated fatty acids in DDGS is high, oxidation occurs easily, which is harmful to animal health, lowers the energy value, and affects production performance and product quality such as carcass quality and milk quality. Therefore antioxidants must be used. 3)
Anti-nutritional factors: the by-product DDGS and rice bran have high fiber content, and monogastric animals cannot utilize it. Therefore enzyme preparations are used to improve the animals' utilization of fiber. In addition, some by-products may contain phytohemagglutinin, gossypol, etc., whose activity should be greatly reduced after processing. 4)
The possibility of contamination by other pathogenic bacteria. Q: Does an excessive addition level of DDGS cause palatability problems? A: Improper use of corn distillers dried grains with solubles (DDGS) will affect the palatability of the feed. Taking DDGS as an example, when it is freshly produced it has a very strong alcoholic smell; if used to produce pig feed, adding 5%-6% will cause a decline in feed palatability, but after being stored for a period of time, the pungent odor is noticeably reduced and palatability improves.
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A very good post, learned a lot~~
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Let's exchange more~~
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Thanks a lot, it has practical value
Q: What is the sulfur content in DDGS? A: Sulfuric acid is added to adjust the pH value, and the amount added varies among manufacturers. The sulfur content in corn DDGS is 0.34%-1.05%. Q: What about the variation in lysine in DDGS? A: DDGS is deficient in lysine and tryptophan, and the variation is also great. Lysine averages 0.89%, range: 0.61-1.06%. Q: When the backfill ratio of DDS in DDGS differs, how do the nutritional components change? A: The higher the backfill ratio of DDS, the lower the protein content, the higher the fat content, and the phosphorus content also increases. For example, a DDGS product with DDG/DDS (60/40): crude protein 28.2%, crude fat 10.0%, P 0.81%; for example, a DDGS product with DDG/DDS (80/20): crude protein 31.4%, crude fat 8.6%, P 0.68%. Q: What effects do by-products such as DDGS have on animal growth and health, and how can they be prevented? A: When using such by-products, one must grasp the exact nutritional composition, advantages and disadvantages of the by-products. In addition, regarding animal health, attention should be paid to: 1)
Mycotoxin problem: by-products have high moisture content and the grain is already damaged, so mold grows easily; therefore the mycotoxin content is very high, and multiple mycotoxins may be present, causing mycotoxicosis in livestock. This leads to low immunity and susceptibility to disease, and decreased production performance. Therefore mold inhibitors and broad-spectrum mycotoxin adsorbents must be used. 2)
Because the proportion of unsaturated fatty acids in DDGS is high, oxidation occurs easily, which is harmful to animal health, lowers the energy value, and affects production performance and product quality such as carcass quality and milk quality. Therefore antioxidants must be used. 3)
Anti-nutritional factors: the by-product DDGS and rice bran have high fiber content, and monogastric animals cannot utilize it. Therefore enzyme preparations are used to improve the animals' utilization of fiber. In addition, some by-products may contain phytohemagglutinin, gossypol, etc., whose activity should be greatly reduced after processing. 4)
The possibility of contamination by other pathogenic bacteria. Q: Does an excessive addition level of DDGS cause palatability problems? A: Improper use of corn distillers dried grains with solubles (DDGS) will affect the palatability of the feed. Taking DDGS as an example, when it is freshly produced it has a very strong alcoholic smell; if used to produce pig feed, adding 5%-6% will cause a decline in feed palatability, but after being stored for a period of time, the pungent odor is noticeably reduced and palatability improves.
--------------------------------------
A very good post, learned a lot~~
--------------------------------------
Let's exchange more~~
--------------------------------------
Thanks a lot, it has practical value