Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 534368
Title Laminaria digitata phlorotannins decrease protein degradation and methanogenesis during in vitro ruminal fermentation
Author(s) Vissers, Anne M.; Pellikaan, Wilbert F.; Bouwhuis, Anouk; Vincken, Jean Paul; Gruppen, Harry; Hendriks, Wouter H.
Source Journal of the Science of Food and Agriculture 98 (2018)10. - ISSN 0022-5142 - p. 3644 - 3650.
Department(s) Food Chemistry Group
Animal Nutrition
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Methanogenesis - Phlorotannins - Protein degradation - Ruminal fermentation
Abstract Background: Phlorotannins (PhTs) are marine tannins consisting of phloroglucinol subunits connected via carbon-carbon and ether linkages. These have non-covalent protein binding properties and are, therefore, expected to be beneficial in protecting protein from hydrolysis during ruminal fermentation. In this study, the effectiveness of a methanolic PhTs extract from Laminaria digitata (10, 20, 40, 50, 75 and 100g kg-1 tannin-free grass silage, with or without addition of polyethylene glycol (PEG), was investigated in vitro on protection of dietary protein and reduction of methane (CH4) in ruminal fluid. Results: Addition of PhTs had linear (P<0.0001) and quadratic (P=0.0003) effects on gas and CH4 production, respectively. Optimal dosage of PhTs was 40g kg-1 as at this point CH4 decreased (P<0.0001) from 24.5 to 15.2mL g-1 organic matter (OM), without affecting gas production (P=0.3115) and total volatile fatty acids (P=1.000). Ammonia trended (P=0.0903) to decrease from 0.49 to 0.39mmol g-1 OM, indicating protection of protein. Addition of PEG inhibited the effect of tannins at all dosage levels, and none of the fermentation parameters differed from the control. Conclusion: PhTs effectively protected protein from fermentation and reduced ruminal methanogenesis.
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