Are you feeding chickens with new corn?
Some problems such as diarrhea of livestock and poultry, increased feed intake, decreased egg production or growth stagnation are often encountered in the first period of new corn use. This is mainly due to the large amount of resistant starch, high water content, low energy, and prone to mildew and deterioration of new corn. Recently, Richi Machinery has collected some information in this area. Now I will tell you some points that need to be paid attention to:
1. The resistant starch problem of new corn
Corn is a post-maturing physiological crop. New corn has the highest resistant starch content, and the content gradually decreases after storage for a period of time (5-6 weeks). Direct drying of new corn, due to starch modification, increased amylose, which also affects the digestibility to a certain extent.
As a new type of dietary fiber, resistant starch has been studied in food. Because it is indigestible and not absorbed, it will not increase calories to the human body. It can increase satiety, reduce energy intake, and help reduce weight, promote fat oxidation, and increase Fat discharge. The above effects are beneficial to human body weight loss, but have a negative impact on animal production. Therefore, symptoms such as soft stools and high feed remuneration may appear to varying degrees.
2. The problem of feeding new corn directly to chickens
(1) Diarrhea
New corn has insufficient maturity at the head of the ear of corn, and lack of late maturity. Therefore, the amount of resistant starch is large. Resistant starch is not digested in the small intestine, but is easily used by E. coli in the large intestine, producing toxins and causing diarrhea.
It should be noted that during the new corn market season, weather factors and seasonal diseases can easily lead to diarrhea.
(2) High moisture and low energy
New corn has a high moisture content after being dried in the sun, most of which have a role of 17%, and there is very little dry corn within 13%. The moisture content is about 17%. After being processed into full-price materials, it feels not wet, but the nutrients are not balanced. With the loss of water, the vitamins, fat, energy, protein and other components in the corn will be lost, resulting in a decline in feed efficiency and an increase in feed-to-meat ratio.
New corn has excessive moisture and low energy, which will cause the feed intake of the flock to increase (however, the laying rate of laying hens has decreased because the digestive energy is directly reduced), drinking water is reduced, and the feed spoilage cycle is shortened.
It should be noted that some farmers think that new corn has low energy, so when preparing feed, they directly add fuel to make up. Some people in the industry responded that doing so would increase the diarrhea of poultry.
(3) Mildew
Corn mold is divided into storage mold and field mold. Approximately 25% of grains have been contaminated by mold before and after harvest. New corn has high moisture content and high breathing strength. The existence of mold causes a high risk of fever and mildew in short-term storage, and it is more likely to cause mildew after processing and crushing.
Mycotoxin, a derivative of mold, destroys the body’s immune system, such as chicken's thymus, spleen, bursa of fabric and bone marrow, liver, etc., greatly reducing the disease resistance of chickens and increasing infections of chickens with Newcastle disease, avian influenza, and spreading. The incidence of viral diseases will bring serious economic losses.
3. Precautions for using new corn
In view of the situation of new corn, it is necessary to pay attention to the adjustment of the formula. The principle is that the dry matter nutrition of the chicken feed remains unchanged.
(1) Strengthen the quality control of new corn, and appropriately use a compound enzyme preparation with a reasonable ratio and a strong target.
(2) Appropriate ageing should be more than one month.
(3) It can be gradually mixed with high-quality old corn for transition, and the transition period is more than half a month.
(4) Seek corn substitute products such as wheat and its by-products, rice, rice bran, palm kernel meal, etc., so as to reduce the amount of corn at this stage.
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