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Impact of inulin supplementation on mitigating ruminal emissions of methane

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Abstract  

Ruminal fermentation of feed leads to methane production and wastes feed energy. Appropriate feed additives have shown to reduce ruminal methane production. Accordingly, it is important to identify compounds as feed additives to alter ruminal fermentation patterns to improve feed efficiency as well as reduce methane production. This experiment aimed to investigate the effect of inulin additive (as a prebiotic compound) on ruminal fermentation, feed digestibility, and methane production by in vitro techniques. Experimental treatments included control treatment (basal diet), 2% (w/w) inulin (basal diet with 2% inulin), and 4% (w/w) inulin (basal diet with 4% inulin). Gas production at 2, 4, 6, 12, 24, 48, 72, and 96 h of incubation as well as dry matter (DM) and organic matter digestibility (OMD) was determined. Also, some rumen fermentation parameters including pH, ammonia–nitrogen, volatile fatty acids, and methane production were determined. Per our findings, the addition of inulin increased gas production except for the first 2 h of incubation (p < 0.05). The addition of inulin changed the profile of ruminal volatile fatty acids (p < 0.05) so that the addition of inulin increased the concentration of propionic acid (p < 0.05). The addition of inulin also reduced lactic acid concentration (p < 0.05). Rumen ammonia–nitrogen was reduced by the addition of inulin (p < 0.05), which could indicate an improvement in rumen nitrogen metabolism. Addition of inulin reduced methane production from feed fermentation by rumen microbiota (p < 0.05). Dry matter and organic matter digestibility increased with the addition of inulin (p < 0.05). According to the results, the use of inulin (as a prebiotic of plant origin) not only does not disrupt ruminal fermentation but also improves the fermentation process, increases feed digestibility, and most importantly reduces methane excretion, which can increase production efficiency.

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Data availability

The datasets generated during and/or analyzed during the current study are available from Dr. Hamid Paya on reasonable request.

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Funding

This work has been supported by University of Tabriz, International and Academic Cooperation Directorate, in the framework of TabrizU-300 program.

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Authors

Contributions

HP, AT, and IG conceived and designed research. AH, KH, MM, HP, VP and SS conducted experiments. NE contributed new reagents or analytical tools. VP and TA analyzed data. HP wrote the manuscript. All authors read and approved the manuscript.

Corresponding authors

Correspondence to Hamid Paya or Valiollah Palangi.

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Ethics approval

This study was performed in accordance with experimental animal ethics committee of the University of Tabriz (Protocol no. IR.TABRIZU.REC.1400.029).

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Not applicable.

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This study did not involve children or individual details, but 100% data usage.

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The authors declare no competing interests.

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Novelty

Due to the increase in world population, the use of livestock products is of particular importance. Ruminant breeding greatly contributes to methane emission due to fermentation of feed by ruminal microorganisms. Methane production, on the one hand, intensifies the greenhouse effect and, on the other hand, wastes feed energy and reduces feed efficiency. In this context, researchers have conducted numerous experiments to introduce feed additives to change the rumen fermentation process in the rumen and reducing methane production while increasing feed efficiency. One of the natural additives that can change the feed fermentation pattern in rumen is inulin, which has been studied in this study.

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Paya, H., Giannenas, I., Taghizadeh, A. et al. Impact of inulin supplementation on mitigating ruminal emissions of methane. Biomass Conv. Bioref. 14, 8493–8501 (2024). https://doi.org/10.1007/s13399-022-02882-7

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