In the autumn season, with the listing of new corn, new corn has received people's preference as an important feed ingredient. However, during the period when the new corn was used, it often encountered problems such as diarrhea of ​​livestock and poultry, and high feed returns. So what are the problems with new corn in the process of formulating feed?
First, the new corn moisture is high
The newly harvested corn is generally 15%-20% in North China and 20%-30% in Northeast China and Inner Mongolia. High moisture will destroy the active ingredients such as vitamins in the diet, reduce the level of metabolic energy and crude protein in the diet, and break the balance between nutrients in the diet, so it is best to solve by purchasing qualified quality corn, or according to Adjust the nutritional level of the diet by the effect of moisture differences.
Second, the new corn resistant starch high
Corn is a post-ripe physiology crop. The content of resistant starch in new corn is the highest, and the content is gradually decreased after storage for a period of time (5-6 weeks). Dried and dried new corn, due to starch denaturation, increased amylose, also affects the digestibility to some extent.
As a new type of dietary fiber, resistant starch is more studied in food. Because it does not digest and does not absorb, it will not increase calories, increase satiety, reduce energy intake, help reduce body weight, promote fat oxidation, and increase Fat is discharged. The above effects are beneficial to the body's weight loss, but have a negative impact on animal production, so symptoms such as soft stools and high feed compensation may occur to varying degrees.
Third, the imperfect grain of new corn
Moldy mold is a kind of imperfect grain. Most farmers think that corn mold changes only occur during corn storage, but in fact, corn mold is divided into storage mold and field mold. About 25% of cereals have been contaminated by mold before and after harvesting. The potential of mold and the presence of mycotoxins have made it difficult to control feed quality. Adding mycotoxin adsorbents is a method, but the key is to attach great importance to the problem of mold contamination. Increase the monitoring intensity to control the moldy particles in the range of 1%. In addition to moldy particles, imperfect granules also include heat-damaged granules, sprouts, lesions, breakage, and insect damage and impurities. Heat damaged grains and broken grains of corn should be paid attention to. The new corn itself has a large respiratory intensity, and the existence of imperfect grains causes the risk of short-term storage of heat and mildew to remain large, and the value of feed is reduced. Monitoring should be strengthened during the acquisition.
Fourth, the new corn paste is not high
The gelatinization temperature of corn is 64-72 ° C, and the gelatinization degree within 95 ° C is improved with the increase of temperature. The gelatinization of the starch after gelatinization increased, and the daily weight gain, feed efficiency, and number of lower steaming heads of the animals all improved with the improvement of the gelatinization degree of corn starch. Because of the high water content, the new corn is difficult to add steam during the quenching and tempering of the feed, and the amount of steam absorbed by the material is small, and the degree of gelatinization is not high. At the end of autumn and early winter, the temperature is low, and if the quenching and tempering temperature is too low or too short, the gelatinization effect will be worse, which will directly affect the feeding effect.
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