Effects of microalgae species on in vitro rumen fermentation pattern and methane production
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Date
2019-09-12
Authors
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Publisher
Walter De Gruyter
Abstract
This experiment was conducted to establish the effects of two types of microalgae [Chlorella vulgaris (AI), C. variahilis (AII) and their combination (AI+AII)] with two substrates (wheat and corn silages) on rumen fermentation, gas and methane production. To each substrate, one of 3 algae treatment was supplemented at 0% and 25% of the total incubated dry matter. A series of 5 measurement points (3, 6, 12, 24 and 48 h) were completed and the gas production was monitored. The proximate and mineral composition of microalgae and substrates were examined. At 48 h incubation rumen fermentation variables and CH4 production were also assessed. When compared with wheat silage, corn silage caused an increase in gas production (P<0.05). Ruminal gas production decreased in the algae groups when compared to the controls (0% algae, wheat and corn silages, P<0.05). Among algae, C. vulgaris had the strongest effect, decreasing gas production by 34%. Among algae, the total volatile fatty acids (VFA) and CH4 production were found to be lower in C. variabilis (P<0.001). Ammonia-N increased with the algae inclusion (P<0.05). But, the ruminal gas production, pH, acetate, the total VFA, CH4 and rumen fermentation efficiency were not affected by the substrate and algae interaction (P>0.05). The prop' ate was the highest (P<0.05) for corn silage when incubated with C. vulgaris. Ruminal butyrate was the lowest for the wheat silage when incubated with the mixture of algae (P<0.05). The NH3-N was the highest in corn silage when incubated with all algae types (P<0.05). Careful selection and combination of substrate and algae may positively manipulate rumen fermentation and may inhibit CH4 production. Further research is needed to validate these results in viva.
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Keywords
Agriculture, Chlorella, Microalgae, In vitro, Methane production, Rumen fermentation pattern, Acid, Supplementation, Protein, Algae, Strategies, Digestion, Abatement, Starch, Plant
Citation
Sucu, E. (2020). "Effects of microalgae species on in vitro rumen fermentation pattern and methane production". Annals of Animal Science, 20(1), 207-218.