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Green Algae

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...

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Screening macroalgae for mitigation of enteric methane in vitro.

D E Wasson¹, H Stefenoni², S F Cueva²

¹Department of Animal Science, The Pennsylvania State University, University Park, PA, 16802, USA. dew5148@psu.edu.

Scientific Reports

|June 17, 2023

Summary

Asparagopsis taxiformis significantly reduced enteric methane production in cattle by 99% in vitro. However, this macroalga also inhibited overall rumen fermentation, with no other species showing similar methane mitigation potential.

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Area of Science:

Agricultural Science
Marine Biology
Microbiology

Background:

Enteric methane emissions from ruminants contribute to greenhouse gases.
Macroalgae are being explored as natural feed additives to mitigate methane production.
Understanding the effects of diverse macroalgae species on rumen function is crucial.

Purpose of the Study:

To evaluate the in vitro efficacy of 67 macroalgae species in reducing ruminal methanogenesis.
To assess the impact of macroalgae on rumen fermentation parameters and microbial communities.
To identify potential macroalgae candidates for mitigating enteric methane emissions.

Main Methods:

In vitro incubation of 67 macroalgae species at a 2% inclusion rate.
Automated gas production system used for 24-hour incubations.
Analysis of methane yield, total gas production, volatile fatty acids (VFA), and microbial community profiles.

Main Results:

Asparagopsis taxiformis (AT) reduced methane yield by 99%; Colpomenia peregrina showed a 14% reduction. No other species affected methane yield.
AT decreased total gas production (14%) and VFA concentration (10%), altering VFA profiles (increased propionate, butyrate, valerate).
AT altered microbial community structure and decreased specific methanogen gene activities, indicating broad fermentation inhibition.

Conclusions:

Asparagopsis taxiformis is highly effective at reducing in vitro methane production but inhibits overall rumen fermentation.
No other macroalgae species tested demonstrated significant methane mitigation potential.
Further research is needed to optimize macroalgae use for methane reduction without compromising rumen function.