Xylan exists mostly in the secondary cell wall of vegetable cell，situates between lignose and other polysaccharide, acts as a connector. The amount of xylan contained in different plant varies. As we know, Xylan content in wheat and its by-product is very high, e.g., the xylan content in wheat bran is as high as 20 - 21%, which is the foremost anti-nutrition factor that affects the wheat materials' application in feedstuff. In fact, in our country, even in the most popular feed raw material i.e., corn meal, soybean meal, xylan is also the most important anti-nutrition factor. For instance, xylan content in corn is between 3.7 - 4.4%, occupies around 40% of cell wall overall composition, is the upmost anti-nutrition factor in corn. And the xylan content in soybean also reaches 6%. Besides，in other processing by-products such as rice bran, unconventional material, the content of xylan is even higher. So, xylan is universally existing in all kinds of feed raw materials，is one of the foremost anti-nutritional factors in feedstuff. |
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