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19 April 2016 Ruminal in vitro gas production, dry matter digestibility, methane abatement potential, and fatty acid biohydrogenation of six species of microalgae
U.Y. Anele, W.Z. Yang, P.J. McGinn, S.M. Tibbetts, T.A. McAllister
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Abstract

This study evaluated the composition, digestibility [dry matter digestibility (DMD)], CH4 abatement potential, and fatty acid biohydrogenation of six species of microalgae. Lipid content ranged from 115 g kg-1 dry matter (DM) (Scenedesmus sp. AMDD) to 361 g kg-1 DM (Tetracystis sp.), while Scenedesmus sp. AMDD had the highest carbohydrate (364 g kg-1 DM) and fibre content (277 g kg-1 DM). Gas production was highest (P < 0.001) for Micractinium reisseri and Chlorella vulgaris. In vitro DMD ranged from 654 g kg-1 for Scenedesmus sp. AMDD to 797 g kg-1 for Nannochloris bacillaris. Total CH4 differed (P < 0.001) among microalgae, ranging from 1.76 mL g-1 DM for Tetracystis sp. to 4.07 mL g-1 DM for M. reisseri. Nannochloropsis granulata (marine) had higher myristic, palmitoleic, and eicosapentaenoic acid levels than freshwater microalgae. Levels of a-linolenic acid were higher in Scenedesmus sp. AMDD than all other microalgae. CH4 production negatively correlated (P < 0.05) with levels of total carbohydrate, oleic, and a-linolenic acid. Despite having a lower lipid content, CH4 reductions with Scenedesmus sp. AMDD were comparable to Tetracystis sp. and N. bacillaris. Reductions in CH4 with Tetracystis sp. and N. bacillaris occurred without a decline in DMD, suggesting that overall microbial activity was not inhibited.

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U.Y. Anele, W.Z. Yang, P.J. McGinn, S.M. Tibbetts, and T.A. McAllister "Ruminal in vitro gas production, dry matter digestibility, methane abatement potential, and fatty acid biohydrogenation of six species of microalgae," Canadian Journal of Animal Science 96(3), 354-363, (19 April 2016). https://doi.org/10.1139/cjas-2015-0141
Received: 12 September 2015; Accepted: 1 February 2016; Published: 19 April 2016
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