Intestinal microbial community well explain larval growth than feed types.

Area of Science:

• Insect farming
• Microbiology
• Sustainable agriculture

Background:

• Black soldier fly larvae (BSFL) are a sustainable livestock feed ingredient.
• Optimal BSFL development requires understanding feed substrate and intestinal microbiota interactions.
• Nutrient synthesis in BSFL is influenced by both diet and gut microbes.

Purpose of the Study:

• To investigate how feed nutrients and intestinal microbes contribute to protein and fat synthesis in BSFL.
• To elucidate the mechanisms by which different feed substrates modulate BSFL nutrient production.
• To assess the role of microbial functional metabolism in BSFL growth and nutrient utilization.

Main Methods:

• Larval rearing on different feed substrates (chicken feed, wheat bran).
• Analysis of microbial metabolism in different regions of the larval intestine.
• Correlation of microbial activity with larval protein and fat biomass accumulation.

Main Results:

• Larvae fed chicken feed exhibited higher fat biomass, linked to enhanced fatty acid metabolism in the middle intestine.
• Larvae fed wheat bran showed higher protein biomass, associated with stimulated amino acid metabolism in the posterior intestine.
• Feed substrate composition significantly impacts the functional metabolism of intestinal microbes, influencing nutrient synthesis.

Conclusions:

• Intestinal microbial communities play a pivotal role in regulating protein and lipid synthesis in BSFL, often more so than the feed substrate alone.
• The type of feed substrate influences specific microbial metabolic pathways within the larval gut, directing nutrient synthesis.
• Optimizing BSFL production involves considering both feed composition and the modulation of intestinal microbiota for efficient waste conversion.