Practical microalgal supplementation: reducing ammonia emission from manure in commercial layer production.

The expression level of NifH increased in control group, while it showed a decreasing trend in the experimental group (Fig. 2 d).

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Through amplicon sequencing, we found that the species diversity of fecal bacteria showed an increasing trend within 24 h, while the bacterial α diversity (Shannon index) decreased after the intervention of compound microalgal powder (Fig. 5 a).

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