# A New Approach Integrating Brood-Associated Semiochemicals with Additional Feeding for Honey Bee (Apis mellifera) Colony Development

## TL;DR

This study shows that using brood pheromones and protein feeding can boost honey bee colony growth during food shortages.

## Contribution

The study introduces a novel method combining brood semiochemicals and feeding to enhance honey bee colony development.

## Key findings

- Colonies treated with brood ester pheromones and fatty acid blends showed increased queen egg-laying.
- Protein supplementation combined with pheromones improved brood production and colony development.
- Fatty acid-supplemented diets with pheromones outperformed standard protein diets.

## Abstract

Reductions in floral resources caused by climate change and agricultural intensification increasingly challenge honey bee colony development. Under these conditions, additional feeding and methods that stimulate colony activity are often needed to support colony growth. In this study, we evaluated the effects of brood-associated semiochemicals combined with additional feeding on the development of Apis mellifera colonies. Colonies receiving combined stimulation showed increased queen egg-laying, which led to improved brood production and overall colony development compared to untreated control colonies. This research contributes to a better understanding of the physiological and behavioral mechanisms that help maintain strong and resilient honey bee colonies.

The aim of this study was to identify chemical formulations that stimulate Apis mellifera colony development by enhancing queen egg-laying under protein-supplemented conditions. Feeding trials were conducted in early spring, when natural food sources are scarce. The experiment was conducted in two Romanian apiaries and included four treatment groups. Three formulations included protein-enriched bee food: two standard variants and one supplemented with essential fatty acids. All were administered alongside behavioral stimulants (T1–T3). A fourth treatment served as a control, containing only protein-based food without brood pheromones or additional stimulants (T4). Pheromone blends were formulated based on brood-emitted volatiles identified by solid-phase microextraction-gas chromatography coupled with mass spectrometry (SPME–GC–MS). The effects of the treatments were evaluated by measuring queen egg-laying and brood area development. Results showed that treatments based on brood ester pheromones (BEP)–T1 and a fatty acid blend (FAB)–T3 significantly stimulated queen egg-laying and brood production, with comparable performance and a slight advantage for T3. In contrast, combining BEP with a fatty acid-supplemented protein diet (T2) produced a moderate effect, consistent with regulated lipid intake in honey bee colonies. These findings indicate that brood-associated semiochemicals, combined with protein supplementation, can effectively stimulate colony growth.