The invention relates to the technical field of
crop straw feed treatment, and discloses a
steam explosion rice straw feed preparation method based on secondary boosting, which comprises the following steps: S1,
raw material pretreatment: crushing rice straws into strip-shaped structures of 3-5cm, and removing iron; s2, chemical pretreatment: adding
urea or
ammonia water in a certain proportion of the
dry weight of the straws into the crushed straws, adjusting the
water content, and carrying out a sealed reaction; s3, primary pressure increasing: the pretreated
straw is loaded into a
steam explosion device, saturated steam is introduced, the pressure is maintained at 0.8-1.4 MPa, and the pressure is maintained for 30-400 seconds; s4, secondary pressure boosting explosion: introducing saturated steam after the pressure maintaining time is reached, rapidly increasing the pressure to 1.5-1.8 MPa, and instantly releasing the pressure; and S5, collecting a product. The
neutral detergent fiber content (NDF) and the acid detergent
fiber content (ADF) of the
rice straw feed are remarkably reduced, and meanwhile the
straw tearing effect, the crude
protein content, the
fiber degradation rate and the feeding value are improved.