Their molecular weights are usually lower than that of cellulose and they have a weak undifferentiated structure compared to crystalline cellulose. But the chains form a 'ground' - they bind with pectin to cellulose to form a network of cross-linked fibres.
Hemicelluloses include xylan, glucuronoxylan, arabinoxylan, glucomannan, and xyloglucan.
As percent content of hemicellulose increases in animal feed the voluntary feed intake decreases.