1. Characteristics of new corn
1. 1 New corn has high water content and is easy to be moldy.
The moisture content of newly harvested corn is high, which is 15 ~ 20% in North China. The moisture content of new corn in northeast China is high, which can reach 20 ~ 30%; If there is more precipitation when the corn matures, the water content of the corn will be higher, up to 40%. Direct use of high-moisture corn will dilute the nutrient concentration, resulting in low metabolic energy and protein level in diet, increased intake and decreased drinking water. Corn with high water content is prone to mildew during stacking, and mycotoxin, a derivative of mold, will destroy the immune system of the body. Moreover, due to the different stacking thickness and uncertain time, the moldy degree will be different, which increases the processing difficulty.
1.2 the role of mold in the growth of maize
Most farmers think that corn mildew only occurs during corn storage, but in fact corn mildew is divided into storage mildew and field mildew. About 25% corn was contaminated by mold before and after harvest. The existence of potential mold and mycotoxin makes it more difficult to control feed quality. The latent mold in the field is alive, not as visible as the mold in storage, which increases the difficulty of control. Adding mycotoxin adsorbent is certainly a way, but the key is to attach great importance to the problem of mold pollution, strengthen monitoring and control the raw mold particles within the range of 65438 0%.
1.3 has many imperfect lines.
With the improvement of mechanization, more and more people choose to harvest and thresh directly with machines, which increases the imperfection of particles.
1.4 The resistant starch content of new corn is higher.
Corn is a second mature crop, and its maximum productivity can only be exerted after the second maturity. When corn is left for more than one month, it will mature for the second time, and the content of resistant starch will decrease. Some indigestible polysaccharides will be converted into digestible starch, which will improve the digestibility. Resistant starch, also known as resistant starch and indigestible starch, can not be hydrolyzed in small intestine, but can be fermented with volatile fatty acids in human gastrointestinal colon. This kind of starch is more difficult to degrade than other starches, and it is digested slowly in the body, absorbed slowly and enters the blood slowly. Its properties are similar to soluble fiber, and it has a certain slimming effect. In recent years, it has been favored by beauty lovers. This is good for slimming, but it has negative effects on livestock and poultry, such as soft stool and high feed reward.
2. New corn use solutions
2. 1 Moderately aged, leaving for more than one month.
2.2 Seek corn substitute products such as wheat and its by-products, rice, rice bran, palm kernel powder, etc. And reduce the consumption of corn at this stage.
2.3 Add a proper amount of targeted compound enzyme preparation.
2.4 Mixed with high-quality aged corn in a proper proportion for transitional use.
In order to test the suitable ratio and application scheme, in 20 12 years, our company and Weifang Tai Sen Xinchang Feed Co., Ltd. conducted a broiler feed grouping test, one group used brand-new corn; The ratio of new and old corn in the two groups was 3: 1, and all the new corn was used after 45 days. The ratio of new and old corn in the three groups was 3: 1, and Longchang bile acid was added to each ton of feed. After 45 days, all the new corn was used. The results showed that all the new corn used in one group would cause diarrhea in laying hens. The second group will have mild diarrhea; There was no diarrhea in the three groups.
Longchang bile acid has certain antibacterial and bacteriostatic effects. Longan bile acid can destroy or combine with bacterial toxins in the gastrointestinal tract to form a complex that is not easily absorbed, and inhibit bacterial heterotopia and endotoxin absorption. Bile acids can also help maintain the acid-base balance of the intestine and maintain the health of small intestinal villi.
New corn should pay attention to the possible unfavorable factors while bringing breeding benefits, and minimize the unfavorable factors as much as possible.