Effect of induced saliva flow on fluid retention time, ruminal microbial yield and methane emission in cattle

Both in vitro and animal studies indicated that a higher dilution rate is related to a more efficient microbial synthesis and a lower methane (CH4) yield. The latter could be a consequence of the former, as an increase in microbial cell synthesis offers an alternative hydrogen sink competing with me...

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Bibliographic Details
Published in:Journal of animal physiology and animal nutrition 2023-05, Vol.107 (3), p.769-782
Main Authors: Zhang, Xiaoyu, Li, Yang, Terranova, Melissa, Ortmann, Sylvia, Kehraus, Saskia, Gerspach, Christian, Kreuzer, Michael, Hummel, Jürgen, Clauss, Marcus
Format: Article
Language:English
Subjects:
Animal Feed - analysis
Animals
Body weight
Cattle
Diet - veterinary
Digestibility
Digestion
Dilution
Dosage
Emission analysis
Emissions
Fatty acids
Female
Fermentation
Flow velocity
Fluid flow
Forage
Lactation
Latin square design
Liquid flow
Metabolism
Methane
Methanogenesis
microbial synthesis
Microorganisms
Milk - metabolism
passage rate
Pilocarpine
Pilocarpine - metabolism
Pilocarpine - pharmacology
Retention
Retention time
Rumen - metabolism
ruminant
Saliva
salivation
Silage - analysis
Synthesis
Water intake
Water intakes
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Summary:Both in vitro and animal studies indicated that a higher dilution rate is related to a more efficient microbial synthesis and a lower methane (CH4) yield. The latter could be a consequence of the former, as an increase in microbial cell synthesis offers an alternative hydrogen sink competing with methanogenesis. To test this assumption in live animals, we applied a saliva stimulant, pilocarpine, to modify liquid flow rate in cattle. Four non‐lactating cows (750 ± 71 kg) were fed forage only (restricted to constant intake) in a 4 × 4 Latin square design with oral doses of 0, 1, 2.5 and 5mg pilocarpine/kg body weight and day. We quantified feed and water intake, ruminal and total tract mean retention time (MRT) of solute and particle markers, ruminal microbial yield (via urinary purine bases or metabolic faecal nitrogen), CH4 emission, digestibility, chewing behaviour, reticular motility and rumen fluid parameters. The effect of induced saliva flow was evident by visibly increased salivation and water intake. Increasing the pilocarpine dosages resulted in a linearly decreased MRT of fluid and small particles (p 
ISSN:0931-2439
1439-0396
DOI:10.1111/jpn.13773