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