超声改善氨化稻秸纤维结构工艺优化及其对瘤胃降解特性的影响

doi:10.16431/j.cnki.1671-7236.2020.07.008

Abstract

Abstract: The objective of this study was to investigate the optimization of ultrasonic to improve the fiber structure of ammoniated rice straw and its effect on rumen degradation characteristics.The response surface analysis of four factors and five levels of central composite was used to design and optimize the ammoniated rice straw fiber modified ultrasonic conditions.Based on the neutral detergent fiber (NDF),acid detergent fiber (ADF) and acid detergent lignin (ADL) content as response values,a multivariate quadratic regression mathematical model was established to obtain the best ultrasound level.The contents of nutrients in ammoniated rice straw under the optimal ultrasonic level and untreated ammoniated rice straw were determined.The degradation rates of dry matter (DM),NDF and ADF in the rumen of cows were determined by nylon bag method,and the dynamic degradation parameters of each nutrient component were obtained.The results showed that ultrasonic power was 112 W,ultrasonic time was 17.3 min,liquid-solid ratio was 10.7 to 1,and ultrasonic power density was 1.317 W/mL,which was the best ultrasonic condition for ammoniating straw.At this ultrasonic level,the minimum contents of ADF and ADL of ammoniated rice straw were 43.75% and 7.95%,respectively,which were significantly lower than those before ultrasonic (P<0.05).The actual results were close to the model prediction,indicating that the model was feasible.Compared with before ultrasound,ammoniated rice straw ADF decreased by 6.64% and ADL decreased by 11.38%.After ultrasonic treatment,the slow degradation part (b),potential degradation part (d) and effective degradation rate (ED) of DM,NDF,ADF of the ammoniated rice straw were significantly improved (P<0.01),the slow degradation parts of which increased by 36.52%,30.06% and 22.19%,respectively,the potential degradation parts increased by 27.15%,28.56% and 21.35%,respectively,and the effective degradation rates increased by 25.09%,24.98% and 24.00%,respectively.In conclusion,appropriate ultrasonic treatment could reduce the content of ADF and ADL in the ammoniated rice straw and improve the effective degradation rate.

Key words: ultrasonic treatment; ammoniated rice straw; fiber structure; optimization; rumen degradation characteristics

CLC Number:

O426.9

ZHENG Jian, YANG Jinshan, FANG Xinpeng, ZHAO Hongbo, ZHANG Yonggen. The Optimization of Ultrasonic to Improve the Fiber Structure of Ammoniated Rice Straw and Its Effect on Rumen Degradation Characteristics[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(7): 2033-2042.

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The Optimization of Ultrasonic to Improve the Fiber Structure of Ammoniated Rice Straw and Its Effect on Rumen Degradation Characteristics

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