Description
Corn belongs to the Poaceae Zea family Zea maize species, originating in Mexico and Peru in Latin America along the foothills of the Andes. After Columbus discovered the American continent, he brought corn to Spain on his second return journey (1499). With the development of the world's navigation industry, corn has gradually spread to all parts of the world and has become one of the most important food crops.
Zeatin has the reputation of longevity food, rich in protein, fat, vitamins, trace elements, fiber and polysaccharides, etc., and has great potential to develop high nutrition and high biological function food.
It is cultivated all over our country. It is widely planted in tropical and temperate regions of the world and is an important cereal.
Corn is native to Central and South America. Cultivated all over the world. It is mainly distributed between 30°--50° latitude. The largest cultivated area is in the United States, China, Brazil, Mexico, South Africa, India and Romania. The main corn producing areas in my country are the Northeast, North and Southwest mountainous areas.
value
Corn has high yield and strong adaptability. The grains and stems of corn are rich in nutrients and are high-quality feed for various livestock. Every kilogram of pork needs 5.6kg of corn grains, and one kilogram of beef needs 10kg. 100kg of corn grains is equivalent to 135kg of oats and 125kg of sorghum. It is an indispensable feed for beef cattle, dairy cows, horses, sheep, pigs, poultry and fish. The whole plant of corn can be fed, with a utilization rate of more than 85%. It is the famous "king of feed". The crude protein content of corn is 5-10%, less cellulose, and good palatability; all kinds of livestock like to eat it. The content of lysine, tryptophan and methionine in corn kernels is insufficient, generally containing 0.2-0.5% lysine, and some new varieties bred recently abroad are as high as 5%.
The amino acid composition contained in each part of corn is different, and the kernel is the most abundant. Corn is also rich in trace elements. It is determined that corn grains contain vitamin A 906.72mg/kg, vitamin B1 0.934mg/kg, vitamin B2 0.272mg/kg, vitamin E 5.073mg/kg, carotene 1.32mg/kg, nuclear yellow Su 3.7-6.3mg/kg. According to the determination of Beijing Agricultural University. Maize has a high digestibility of organic matter. In developed countries, 85% of corn is used as feed, and the grain is used as concentrate for pigs, chickens, dairy cows, and beef cattle. Green mow and silage corn are essential feed for dairy cows. With the development of production, corn is becoming more and more important as a feed crop in our country.
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