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Effect of substituting soybean meal with euglena (Euglena gracilis) on methane emission and nitrogen efficiency in sheep
Open accessAbstract
Abstract This study evaluated methane (CH4) emission, intake, digestibility, and nitrogen efficiency in sheep fed diets containing replacement levels (0%, 33%, 50%, and 67% of soybean meal with euglena). In this experiment, four Corriedale wether sheep with an initial body weight of 53.8 ± 4.6 were arranged in a 4 × 4 Latin square design. This experiment lasted 84 days, divided into four experimental periods. Each period lasted 21 days, which consists of 14 days of adaptation to the diets, 5 days to collect samples, and 2 days to collect gas emission from sheep. Methane emission expressed as L/kg DM intake or g/kg DM intake reduced by up to 37% and the energy loss via CH4 (% of GE intake) reduced by up to 34%. No differences (p > 0.05) were observed in DM and OM intake and whole tract apparent DM digestibility due to substitution of soybean meal with euglena. The total CP loss reduced significantly (linear, p < 0.001) and CP efficiency increased linearly (p = 0.03) with increasing concentration of euglena. As a result, nitrogen balance and average daily weight gain remained unchanged despite higher nitrogen concentration in soybean supplemented group. In conclusion, substitution of soybean meal with euglena reduced methane emission without affecting the performance of animals.
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Euglena sp. has a high crude protein efficiency, leading to fewer digestive losses as methane.
“It also has a high crude protein efficiency, leading to fewer digestive losses as methane [45].”
From Biologically-Based and Physiochemical Life Support and In Situ Resource Utilization for Exploration of the Solar System—Reviewing the Current State and Defining Future Development Needs (2021) · cites this paper as [45]
The Results (Tables 7 and 8; page not supplied) show higher crude-protein utilization efficiency and less energy lost as methane when euglena replaced soybean meal in sheep diets. The Discussion attributes the methane reduction to dietary fatty acids and reduced protozoal activity, not to crude-protein efficiency; the claimed causal link is unsupported. (LLM, conf=0.88)
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“It also has high crude protein efficiency, leading to fewer digestive losses a methan [45].”
Background
Metadata
- Authors
- Aemiro, A., Watanabe, S., Suzuki, K., Hanada, M., Umetsu, K., & Nishida, T.
- Affiliations
- Obihiro University of Agriculture and Veterinary Medicine (JP)
- Euglena Co., Ltd. (Japan) (JP)
- Corresponding author
- Nishida, Takehiro
- Venue
- Animal Science Journal
- Publisher
- Wiley
- Published
- 2018-10-26
- Volume
- 90
- Issue
- 1
- Pages
- 71-80
- ISSN
- 1344-3941 (ISSN-L)
- 1740-0929
- PMC
- PMC6587532
- OpenAlex
- W2898484953
- Cited by
- 16
- References
- 38
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 5 · 2022: 1 · 2021: 2 · 2020: 3 · 2018: 2
- FWCI
- 2.96
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Animal Science Journal (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Ruminant Nutrition and Digestive Physiology
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Anaerobic Digestion and Biogas Production
- Keywords
- Euglena, Euglena gracilis, soybean meal replacement, sheep, methane emissions, enteric methane, nitrogen use efficiency, nitrogen balance, protein efficiency, dietary substitution, Corriedale sheep, feed intake, digestibility
- MeSH terms
- Animals, Animal Feed, Animal Nutritional Physiological Phenomena, Diet, Euglena gracilis, Gases, Male, Methane, Nitrogen, Sheep, Glycine max
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