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This Article Full Text Full Text (PDF) All Versions of this Article: jas.2007-0438v1 86/5/1164    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Tang, S. X. Articles by Shen, S. B. PubMed PubMed Citation Articles by Tang, S. X. Articles by Shen, S. B.

Effects of yeast culture and fibrolytic enzyme supplementation on in vitro fermentation characteristics of low-quality cereal straws¹

S. X. Tang^*, G. O. Tayo, Z. L. Tan^*,2, Z. H. Sun^*, L. X. Shen^*, C. S. Zhou^*, W. J. Xiao, G. P. Ren, X. F. Han^* and S. B. Shen^#

^* Key Laboratory of Subtropical Agro-ecological Engineering, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, Hunan 410125, P. R. China; and Babcock University, P.M.B. 21244, Ikeja, Lagos, Nigeria; and Hunan Agricultural University, Changsha, Hunan 410128, P. R. China; and Hunan Yahua Dairy Industry Co. Ltd., Changsha, Hunan 410005, P. R. China; and and ^# New Hope Group, Chengdu, Sichuan 610041, P. R. China

² Corresponding author: zltan{at}isa.ac.cn

The effects of yeast culture and fibrolytic enzyme preparation (containing cellulase and xylanase) on in vitro fermentation characteristics of rice straw, wheat straw, maize stover, and maize stover silage were examined using an in vitro gas production technique. Four levels of yeast culture and fibrolytic enzyme supplements (0, 2.5, 5.0, and 7.5 g/kg of straw DM, respectively) were tested in a 4 x 4 factorial arrangement. Supplementation of yeast culture increased the cumulative gas production, theoretical maximum of gas production, rate of gas production, IVDMD, and in vitro OM disappearance (IVOMD), and decreased the lag time for each type of straw. Fibrolytic enzyme supplementation tended to increase cumulative gas production, theoretical maximum of gas production, and rate of gas production; prolonged lag time of gas production; and enhanced IVDMD and IVOMD for 4 types of cereal straws, with the significance of this effect being dependent on the level of supplemented enzymes. There were significant interactions between fibrolytic enzymes and yeast on all in vitro gas production parameters, IVDMD, and IVOMD of each type of straw. The outcome of this research indicated that the application of fibrolytic enzyme preparation and yeast culture could improve in vitro gas production fermentation of cereal straws.

Key Words: goat • in vitro gas production • rumen fluid • in vitro digestibility