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Humic substances reduce ruminal methane production and increase the efficiency of microbial protein synthesis in vitro.
Sheng, Ping; Ribeiro, Gabriel O; Wang, Yuxi; McAllister, Tim A.
Affiliation
  • Sheng P; Institute of Biological Resources, Jiangxi Academy of Sciences, Nanchang, China.
  • Ribeiro GO; Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, Canada.
  • Wang Y; Department of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada.
  • McAllister TA; Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, Canada.
J Sci Food Agric ; 99(5): 2152-2157, 2019 Mar 30.
Article in En | MEDLINE | ID: mdl-30298605
ABSTRACT

BACKGROUND:

In ruminants, enteric CH4 represents a major energy loss for the host and is a potent greenhouse gas that contributes to climate change. Previous studies have shown that humic substances (HS) may have beneficial effects on livestock nutrition. The present study investigated the effects of HS on in vitro CH4 production and rumen fermentation.

RESULTS:

Total gas production was linearly increased with increasing HS after 12 h of incubation, although it was unaffected after 24 and 48 h. Increasing HS linearly decreased CH4 at all time points. Increasing HS linearly decreased NH3 -N concentration and the molar proportion of acetate at 12 h, whereas the efficiency of microbial protein (MP) production and total dry matter digestibility (TDMD) linearly increased, with starch digestion (SD) responding quadratically. After 48 h, HS linearly increased MP and TDMD, with neutral detergent fibre digestibility responding quadratically.

CONCLUSION:

Inclusion of HS effectively reduced CH4 production and increased substrate disappearance and the efficiency of microbial protein synthesis in vitro. However, its effect on in vivo CH4 production, rumen fermentation and ruminant production requires further investigation. © 2018 Society of Chemical Industry.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Rumen / Bacteria / Bacterial Proteins / Humic Substances / Methane Limits: Animals Language: En Journal: J Sci Food Agric Year: 2019 Document type: Article Affiliation country:

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Rumen / Bacteria / Bacterial Proteins / Humic Substances / Methane Limits: Animals Language: En Journal: J Sci Food Agric Year: 2019 Document type: Article Affiliation country: