LIMA Fish Feed Machine,Chicken Feed Machine
Wheat drying is not just simply avoid deterioration, and the processing method used also affects its indigestible rate. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
The very humid wheat harvested after harsh weather is often not suitable for human consumption. This harvest condition often leads to germination and increased amylase and protease content. These enzyme content changes can affect the size of the baked food and reduce the strength of the gluten. Therefore, such damaged wheat will be sold to animal feed raw materials market. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
Wheat and other cereal storage requirements are about 14% water content to ensure stable and blocked mold growth. Therefore, if the cereals are moist, drying treatment is required. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
Mildew is a special problem, it can not only consume plant nutrients, reduce the nutritional value of the final product, more seriously, It also produces mold toxins to damage animal health and further improve animal production costs. 7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The moist wheat used in animal feed is usually dried by extreme high temperatures to reduce production costs, and the temperature may be as high as 100 ¡ã C. Typically, heat treatment will be irreversible to change the cereal structure and components. This change is clearly affected by the temperature range and the moisture content.
7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry [123 When there is excess moisture, when the cereal is heated, the natural starch particles begin to absorb moisture and expand, eventually leading to starch to be ldquo; gelatinance rdquo; This can cause the dissolution of the starch particles and the deterioration of the semi-crystalline structure, but this situation is not easy to happen in the state of limiting moisture. In high moisture state, wheat crystallization structures will be done when the temperature is higher than 60 ¡ã C. When the moisture reduction is limited, wheat crystallization structural decomposition requires more energy. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
When the grain starch is completely gear, the digestibility in vitro will be greatly improved. Starch dissolution, amylase active site increases. In some cases, the starch is increased by about one thousand times of enzymatic solution. The starch particles can be observed under an optical microscope or polarized light to detect whether the starch is gelated. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
After harvesting moist grains, we take into account the starch structure changes? Ideally, dryWheat natural moisture content harvested in summer is 14%. However, almost all grain food require a certain degree of drying and processing. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
The higher the moisture content of the grain, the more difficult to harvest, so that moist grains are forced to postpone When the warehouse drops, the cereals can be harvested when the moisture content is lowered. 7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
In the UK, the moisture content of the cereals is less likely to be higher than 25% in the UK, harvesting and heat treatment, generally recommended corn water content At 15% to 19%, however, usually in the case of 30% to 40%. However, a typical starch granule is shown that in order to cause the starch particles crystallization structure (at its gelatinization temperature), the water content must be over 50%. Despite the high water content of the cereals that have just harvested from fields (higher than 30%), the water content is still not enough when the heat treatment temperature reaches 100 ¡ã C during dry. In this way, only the starch in the cereal will lose the structure ordered, gelatinized, which is more easier to digest. Therefore, the starch in the dry cereal is even, it is also very small. 7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The vast majority of poultry feeds have experienced a series of processes, including dry, such as granulation, pressure Slice and micronized treatment, etc., these post-treatment will cause a certain degree of gelatinization. 7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry [ 123] However, it is also necessary to consider the secondary processing, dry heat treatment on the grain affected by the cold harvest weather, in fact, the crystallinity of the starch structure can be improved, the processing process is almost gentructed and reverse crystallization treatment . This may result in more digestive digestion during thermal processing, and is not susceptible to endogenous digestive enzymes, such ldquo; improve rdquo; processing process is referred to as annealing.
7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The annealing is generally considered to be heated at a high moisture, only lower than the starch delay. However, it is also described as a higher conditioned dry heat processed. These may indicate that higher dry heat treatment is better than having a slow dryness than 55 ¡ã C. Because, under the same initial moisture conditions, the long-term lower temperature is more likely to make the starch annealing than the short-term high temperature. 7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The starch-related protein is also affected by heat treatment. Survey has shown that at 30 ¡ã CThe temperature of ~ 50 ¡ã C does not cause certain changes. The starch structure did not change, and most changes occurred on the protein component.
7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
Can these in vitro study be transferred to animal breeding?
7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
Clear drying treatment of the weather should not be confused with cereals applied in animal feed, because the latter uses Extremely high heat, pressure and steam treatment performed in the later stage. The study found that the initial water content was 33% to 38% of corn for 160 ¡ã C heat treatment without affecting its chemical components, but the study did not measure the physical and chemical properties. The drying temperature fluctuates due to the different corn samples.
7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
7G8 China Feed Industry Information Network – Bit Feed, Service Animal Husbandry The authors have studied (not disclosed), compared to 37% wheat compared to the initial water content, the initial moisture content was at room temperature or a high starch digestibility after drying at room temperature or 100 ¡ã C. The starch digestibility can also be improved in a 100 ¡ã C environment while drying. However, microscopic imaging shows that the change in starch integrity does not result in an effect on digestibility, which means that other components may be involved.
7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The above-mentioned other components may be proteins associated with starch particles, this protein is susceptible to heat treatment and moisture content Change.
7G8 China Feed Industry Information Network – Based on Feed, Service Animal Husbandry
The effect of high temperature drying on cereal nutrition quality in poultry diet does not seem to be single and determined. The use of microscopy can be determined in accordance with the integrity failure of starch structure to increase whether the digestibility is improved. A potential risk is that annealed temperature during drying may increase the gelatinization temperature. Therefore, the feed for this method may not be easily digested. High temperature drying by increasing protein degradation with starch to reduce starch digestibility. This effect can only be measured by the protein solubility / recovery experiment, rather than the temperature. Therefore, three quality parameters – microscopy analysis, gelatinization temperature and protein solubility – are useful for the nutritional value of cereals that are affected by drying techniques. 7G8 China Feed Industry Information Network – Based on Feed, Serving Animal Husbandry
(Translated from Feed International, 2011, 1/2, p22-23.) 7G8 China Feed Industry Information Network – Based on feed, serving animal husbandry
