The main component of straw is crude fiber, and animals (including ruminants) cannot secrete their own enzymes that degrade crude fiber. The digestibility of crude fiber by cattle and sheep is 50% to 90%, which is mainly due to the proliferation and metabolism of microorganisms in the rumen. Pigs are rumen-free, and the digestibility of crude fiber is not high, and it is mainly achieved by the activity of microbes in the cecum and colon. If a large amount of straw powder is added to the feed, not only the crude fiber contained therein cannot be digested, but also the digestibility of corn and soybean meal in the feed can be reduced. As a result of experiments, for every 1% increase in the crude fiber content of pig feed, the digestibility of organic matter in the feed will decrease by 1.35% to 1.95%. Therefore, the crude fiber content in the pig feed should be properly controlled. Generally, the crude fiber content in the piglet feed should not exceed 4%, and the crude fiber content in the growing-finishing pig feed should not exceed 6%, and the crude fiber content in the breeding pig feed should not exceed 10%.
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