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Substitution of various agricultural by-products improves fermentation profile and in vitro digestibility of rice straw silage

Published online by Cambridge University Press:  29 June 2022

Sifan Chen Open the ORCID record for Sifan Chen [Opens in a new window] ,
Junfeng Li ,
Zhihao Dong ,
Jian Wang ,
Jie Zhao ,
Siran Wang Open the ORCID record for Siran Wang [Opens in a new window] ,
Yushan Jia  and
Tao Shao
Sifan Chen
Affiliation:
Institute of Ensiling and Processing of Grass, College of Agro-Grassland Science, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
Junfeng Li
Affiliation:
Institute of Ensiling and Processing of Grass, College of Agro-Grassland Science, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
Zhihao Dong
Affiliation:
Institute of Ensiling and Processing of Grass, College of Agro-Grassland Science, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
Jian Wang
Affiliation:
College of Animal Science and Technology, Hainan University, Haikou 570228, China
Jie Zhao
Affiliation:
Institute of Ensiling and Processing of Grass, College of Agro-Grassland Science, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
Siran Wang
Affiliation:
Institute of Ensiling and Processing of Grass, College of Agro-Grassland Science, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
Yushan Jia
Affiliation:
Key Laboratory of Forage Cultivation, Processing and High Efficient Utilization of Ministry of Agriculture, Inner Mongolia Agricultural University, Hohhot 010018, China
Tao Shao*
Affiliation:
Institute of Ensiling and Processing of Grass, College of Agro-Grassland Science, Nanjing Agricultural University, Weigang 1, Nanjing 210095, China
*
Author for correspondence: Tao Shao, E-mail: taoshaolan@163.com
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Abstract

This experiment was conducted to evaluate the impact of substituting rice straw with citrus pulp (CRP), sweet potato peels (SPP) and vines (SPV) on fermentation quality and in vitro digestibility when ensiled with or without wet brewers' grains (WBG). Seven treatments were set as follows: (i) rice straw only (control); (ii) 800 g rice straw/kg + 200 g CRP/kg (RC); (iii) 720 g rice straw/kg + 180 g CRP/kg + 100 g WBG/kg (RC+); (iv) 800 g rice straw/kg + 200 g SPP/kg (RP); (v) 720 g rice straw + 180 g SPP/kg + 100 g WBG/kg (RP+); (vi) 800 g rice straw/kg + 200 g SPV/kg (RV); (vii) 720 g rice straw/kg + 180 g SPV/kg + 100 g WBG/kg (RV+). After ensiling for 3, 7, 14, 30 and 60 days, silos were opened for fermentation profile, aerobic stability and in vitro parameter analyses. All substitution types improved fermentation quality, characterized by significantly lower pH and NH3-N content, higher lactic acid content and V-scores. WBG application promoted hetero-fermentation and significantly increased DM losses, acetic acid and ethanol contents. After 60 days of ensiling, the NDF, ADF and cellulose contents in mixed silages significantly decreased compared to control. During aerobic exposure, WBG application significantly prolonged aerobic stability. SPV substitution significantly improved in vitro digestibility of dry matter, NDF and ADF. In conclusion, the SPP substitution combined with WBG application was recommended as a result of the optimal balance of fermentation quality, aerobic stability and in vitro digestibility.

Keywords

Fermentation qualityhetero-fermentationmixed silageswaste biomasswet brewers' grains
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 160 , Issue 3-4 , June 2022 , pp. 278 - 287
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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