Classification of rice bran
Rice (rice) is one of the main foods for human beings, and it is seldom used to feed livestock. As a feed, rice bran is mainly the by-product of rice processing into rice, and its nutritional value varies greatly due to different processing methods.
According to the different rice processing methods, rice bran can be divided into rice husk (ricehulls), rice bran (ricebran) and rice bran (ricemillby-product).
Rice chaff is the husk (glume) powder removed from rice when processing brown rice, its amount is about 20% of the quality of rice, 44.5% of crude fiber, of which lignin 21.4%, digestible energy (bovine 2.006MJ/ woman, pig 0.907MJ/k) is very low, and digestible protein is negative, so it is pure roughage.
Rice bran is a by-product of brown rice (brownrice) refined into milled rice (polishedrice). It consists of seed coat, aleurone layer, embryo and a small amount of endosperm, accounting for 6%-8% of rice. Rice bran can not only be used as feed, but also can be extracted from rice bran because of its high fat content. Unoiled rice bran is not easy to be preserved because of its high content of unsaturated fat.
There are two types of rice bran, one is a mixture of rice husk (rice husk), chopped rice (brokenrice) and rice bran separated from milled rice by one-time processing, which accounts for about 25% of rice, its nutritional value is between rice bran and rice bran, and the digestible energy of dry matter is 6.730MJ/kg for sheep and 3.846~5.894MJ/kg for pigs, so it should belong to roughage. The other is the artificial mixing of rice bran and rice chaff, which can be divided into 19 bran, 28 bran, Panax notoginseng bran and so on. The composition and nutritional value of rice bran depend on the ratio of rice bran to rice bran. The higher the proportion of rice bran is, the worse the nutritional value is. The bran with high proportion of rice chaff should belong to roughage.
It is difficult to preserve rice bran with high oil content, and the rice bran extracted from oil is defatted rice bran (defattedricebran).
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Occurrence and control of rice water weevil
Rice water weevil is a peer agricultural plant quarantine pest, which first occurred in America and in Asia, such as Japan, South Korea and North Korea. The rice water weevil was first found in China in 1987 in Tanghai County, Hebei Province. The rice water weevil was first found in Ji'an City, Tonghua District in August 1993. At present, this kind of pest occurs to varying degrees in most areas of our province. 1. The harm degree of rice water weevil rice water weevil mainly harms rice, but also harms some crops.
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Late japonica rice "Zhejing 30"
1. Variety introduction "Zhejing 30" was bred by the Institute of crop and Nuclear Technology Utilization of Zhejiang Academy of Agricultural Sciences in the spring of 1995 with Xiushui 63 as female parent and R9475. After years of breeding in the south and north, it was bred by the selection of appearance quality (grain shape, transparency, chalkiness, chalkiness rate) of low generation, resistance identification of disease area, amylose content of higher generation and other physical and chemical quality determination, taste taste, resistance identification breeding methods. Participated in experiments at all levels since 1999 and passed the examination and approval of Zhejiang Variety approval Committee in March 2003.
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