High-potency white-rot fungal strains and duration of fermentation to optimize corn straw as ruminant feed

Xueli Zhao; Fei Wang; Yi Fang; Daowei Zhou; Shuiping Wang; Duanqin Wu; Lixia Wang; Rongzhen Zhong

doi:10.1016/j.biortech.2020.123512

High-potency white-rot fungal strains and duration of fermentation to optimize corn straw as ruminant feed

Bioresour Technol. 2020 Sep:312:123512. doi: 10.1016/j.biortech.2020.123512. Epub 2020 May 8.

Authors

Xueli Zhao¹, Fei Wang², Yi Fang², Daowei Zhou², Shuiping Wang³, Duanqin Wu⁴, Lixia Wang², Rongzhen Zhong⁵

Affiliations

¹ Jilin Provincial Key Laboratory of Grassland Farming, Northeast Institute of Geography and Agoecology, Chinese Academy of Sciences, Changchun, Jilin 130102, China; College of Animal Science, Southwest University, Chongqing 402460, China.
² Jilin Provincial Key Laboratory of Grassland Farming, Northeast Institute of Geography and Agoecology, Chinese Academy of Sciences, Changchun, Jilin 130102, China.
³ College of Animal Science, Southwest University, Chongqing 402460, China.
⁴ Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, Hunan, China.
⁵ Jilin Provincial Key Laboratory of Grassland Farming, Northeast Institute of Geography and Agoecology, Chinese Academy of Sciences, Changchun, Jilin 130102, China. Electronic address: zhongrongzhen@iga.ac.cn.

PMID: 32473472
DOI: 10.1016/j.biortech.2020.123512

Abstract

Five white-rot fungi Pleurotus ostreatus, Lentinus edodes, Hericium erinaceus, Pleurotus eryngii and Flammulina filiformis were studied (solid-state incubation and in vitro gas production) to determine lignin degradation and optimal duration of fermentation of corn straw. All fungi significantly decreased lignin, with optimal reductions after 28 d. Although cellulose also decreased, L. edodes and P. eryngii minimized these losses. In intro dry matter digestibility, total volatile fatty acid concentration and total gas production of fermented corn straw decreased (P < 0.001) as fermentation was prolonged, with improved rumen fermentability for all fungal treatments except F. filiformis. Total gas production in L. edodes did not decrease but peaked on day 28, whereas F. filiformis reduced methane emission. In conclusion, fermentation of corn straw with P. eryngii or L. edodes for 28 d degraded lignin and improved nutritional value as ruminant feed.

Keywords: Corn straw; Feed digestibility; In vitro gas production; Lignin; White-rot fungi.

MeSH terms

Animal Feed*
Animals
Fermentation
Lignin
Rumen
Ruminants
Zea mays*

Substances

Lignin