Web'élevage 3 : L'élevage de mâles, une étape clé.

Webinar on Male Breeding in Beekeeping

Introduction to the Webinar

• The webinar begins at 9 AM, welcoming participants and allowing time for attendees to join.

• Participants are encouraged to use the chat feature for greetings and technical issues while questions should be directed to the Q&A section.

• The host explains how questions will be managed, with answered questions moving to a separate tab for easy reference.

Overview of the Session

• This is the third session in a series of six webinars focused on various aspects of breeding, specifically male breeding today.

• Presenters include Fantine Bado discussing key principles of male breeding, Mathieu Sibué sharing practical management experiences, Jacob Wegner addressing semen quality evaluation, and Guillaume Kirot focusing on environmental impacts on male quality.

Key Concepts in Male Breeding

Importance of Male Breeding

• Breeding males can reduce dependency on external environments during natural fertilization by ensuring desired genetic traits are expressed in colonies.

• Controlled breeding allows for better management of genetics through selective mating strategies.

Steps in Male Breeding Process

1. Preparation of Mating Frames

• Initial step involves creating frames designed specifically for male bees where queens can lay eggs.

2. Selecting Appropriate Colonies

• Choosing colonies that will produce males is crucial; males inherit half their genetics from their mother’s colony but must not be placed directly into it for optimal results.

Managing Mating Frames

• Timing is essential; frames should be prepared about 50 days before planned insemination or fertilization sessions to ensure mature males are available when needed.

• Adequate resources (honey and pollen) must be maintained within colonies to prevent them from sacrificing developing males due to resource scarcity.

Establishing Male Banks

Purpose and Setup

• Creating male banks helps optimize breeding efficiency by ensuring sufficient numbers of mature males are available at critical times.

• Various materials can be used for establishing these banks; considerations include whether or not to introduce a queen into the bank setup.

Management Strategies

1. Choosing Bank Models

• Options include orphaned banks or those with virgin queens; each has implications for colony dynamics and genetic tracking.

2. Tracking Genetics

• Maintaining clear records regarding which genetics are present in each bank is vital for effective selection processes later on.

Conclusion: Best Practices in Male Breeding

Final Considerations

• Allowing males some flight time can enhance maturity rates; however, this needs careful management to avoid overcrowding within banks.

• Overall success hinges on strategic planning around timing, resource availability, and genetic tracking throughout the entire process.

Techniques for Creating a Male Bee Bank

Overview of Techniques

• The first technique involves taking a frame from the "rue Chamal" where the queen has laid eggs, placing a queen excluder on top, and adding an empty body to collect male frames.

• After some time, bees will move into the upper body. The collected frames can then be transferred to the male bank or kept in place with a floor.

• A second method is creating an orphan colony by collecting bees and resources from other hives, ensuring there are enough bees relative to the number of males being raised.

Maintaining Male Banks

• It's crucial to monitor food levels in the male banks; insufficient food leads to sacrificing males. Regular feeding with syrup and protein is necessary.

• Reinforcement may involve adding emerging brood frames based on how the male bank was established. Royal cells may need regular destruction if using virgin queens.

Final Steps Before Use

• When ready to use males, strategies differ based on whether natural fertilization or artificial insemination is employed. For natural fertilization, maximizing male presence in a controlled environment is key.

• During artificial insemination, mature males are collected early in the day when they are less likely to fly away.

Key Stages in Male Bee Rearing

Important Considerations

• Successful rearing requires careful timing of egg laying and maintaining optimal conditions for brood development until emergence.

• Various methods exist for establishing male banks; one example includes using half frames introduced into hives while providing ample nourishment.

Examples of Techniques

• Another method involves preparing frames with specific modifications before introducing them into hives 50 days prior to insemination.

• Monitoring egg-laying after introduction ensures that only fully developed cells remain for future use.

Challenges in Male Bee Rearing

Key Insights

• Raising males is often considered one of the most challenging aspects of bee breeding due to various techniques available that require experimentation.

• Essential factors include maintaining a good ratio of bees to males and managing genetic traceability effectively.

Importance of Resources

• Avoiding Varroa mites is critical as they can damage developing males significantly. Adequate resources must be ensured throughout this process.

Practical Experiences from Beekeepers

Personal Practices Shared

• An experienced beekeeper shares insights about their journey with artificial insemination since 2018 and emphasizes adapting practices over time based on results.

Collaboration Among Beekeepers

• Collaboration within groups allows sharing genetic material among mini-pools which enhances diversity and improves breeding outcomes.

Detailed Methodology for Insémination

Preparation Steps

• Selecting appropriate age ranges for males (15–20 days old), ensuring they are mature yet not too old at insemination time is vital for success.

Timing Considerations

• Careful planning around weather conditions impacts successful mating; adjustments may be needed depending on environmental factors during breeding seasons.

Conclusion

This transcript outlines various techniques and considerations involved in creating effective male bee banks, emphasizing practical experiences shared by seasoned beekeepers while addressing challenges faced during this intricate process.

Importance of Male Bee Management

Building Frames for Males

• Emphasizes the necessity of using male bees in a specific timeframe, particularly during the same season they are built. If constructed in another hive, it may lead to complications with the colony's egg-laying patterns.

• Highlights that if frames are frozen to eliminate any unwanted eggs from other colonies, it can inadvertently destroy some worker bee brood as well.

Preparing Frames in Advance

• Suggests preparing frames a year in advance for better results and discusses the potential benefits of natural fertilization methods.

• Discusses how keeping a portion of uncoated frames can promote male breeding across all colonies, enhancing overall male production.

Frame Reuse and Longevity

Lifespan of Male Frames

• Questions whether reusing male frames over time could result in smaller males due to accumulated cocoons and pollutants; recommends renewing them every 2-3 years.

Number of Males Required

• Raises questions about the necessary number of males for successful fertilization and how many male frames are needed per fertilization hive.

Variability in Practices

Different Approaches to Male Breeding

• Notes that there is no universal standard for the number of males required; practices vary widely among beekeepers based on their specific goals and methodologies.

• Mentions official guidelines from German beekeeping associations regarding minimum numbers of males needed at mating stations, typically ranging from 8 to 20 depending on station size.

Combining Roles: Mating Hives vs. Banks

Dual Purpose Colonies

• Explains that while it's practical to have dedicated mating hives close to insemination labs, one colony can serve both purposes effectively under certain conditions.

Benefits of Maintaining Separate Banks

• Discusses advantages such as maintaining high-quality males by creating separate banks when transhuming strong colonies for production purposes.

Managing Mortality Rates Among Males

Strategies for Reducing Losses

• Advocates for having multiple banks rather than concentrating too many males into one bank to mitigate mortality risks associated with overcrowding or health issues within a single colony.

Pre-Mating Preparations

Importance of Allowing Males to Fly

• Suggestion that allowing males some flight time before insemination improves their readiness despite not being strictly necessary; emphasizes timing during cooler parts of the day for easier collection.

Queen Management During Male Production

Timing Queen Removal

• Discusses removing queens after seven days post-mating initiation as a strategy to reduce mortality rates among males by managing genetic factors related to queen age and health.

Claustration Techniques

Use Cases for Claustration

• Clarifies that claustration is primarily used when ensuring only desired male genetics are present during insemination processes versus more relaxed approaches suitable for natural fertilization scenarios.

Presentation Introduction by Jacob Wekiner

Background Information

• Jacob introduces himself as an expert focusing on bee fertility aspects after transitioning from research roles into private enterprise aimed at improving bee reproductive success.

Factors Influencing Male Fertility

Key Components Affecting Fertility

• Identifies four main components influencing bee fertility: number accepted by the hive, success rate at mating or artificial insemination, quantity and quality of semen collected.

• Discusses challenges faced by breeders due to environmental influences complicating scientific study efforts around these factors.

Impact of Temperature and Varoa on Bee Fertility

Effects of Temperature on Sperm Viability

• When transporting queen bees, exposure to high temperatures can damage sperm in their spermatheca, leading to reduced fertility even if the queen appears healthy.

• High temperatures during natural mating often result in queens being replaced by workers due to decreased acceptance by the colony.

• An ongoing study suggests that elevated temperatures not only reduce sperm vitality but also affect egg viability, increasing abortion rates of fertilized eggs by 20-30%.

Influence of Varoa Mites on Male Bees

• The presence of Varoa mites negatively impacts male bees by reducing sperm count and success rates during mating due to increased competition among males.

• Unlike natural mating, artificial insemination does not exhibit the same selection pressures from Varoa mites, which could be detrimental for breeders relying on natural selection.

Selection Strategies in Breeding Programs

• In Germany, a breeding approach called AGT allows for natural selection against Varoa sensitivity while still managing colonies with known mite infestations.

• This method has been practiced for about 20 years and shows promise in improving genetic resistance without quantifying exact benefits yet.

Importance of Pollen Quality

• Providing adequate pollen is crucial for maintaining male bee quality; malnourished males yield poor-quality sperm affecting overall reproduction success.

• The cost of raising male bees is significantly higher than that of worker bees due to their nutritional needs; thus, ensuring optimal conditions is essential for effective breeding.

Environmental Stressors Affecting Bee Reproduction

Overview of Environmental Impacts

• Guillaume Kerot discusses how environmental stressors contribute to significant declines in bee populations, particularly focusing on reproductive failures linked to male fertility issues.

Factors Influencing Queen Reproductive Health

• Key factors identified include parasites like Varroa destructor and environmental stresses such as food scarcity and premature supersedure symptoms indicating reproductive dysfunction.

Research Findings on Male Fertility

• Studies show that various environmental stressors lead to decreased fertility rates among male bees. These include behavioral changes during mating and lower semen quality impacting offspring viability.

Chemical Exposure Effects

• Chronic exposure to pesticides like neonicotinoids adversely affects male bee health by reducing sperm concentration and increasing mortality rates among spermatozoids.

Consequences of Male Bee Health on Queen Fertility

Experimental Insights into Sperm Viability

• Experiments revealed that queens inseminated with sperm from stressed males showed a 20% reduction in viable sperm stored within their spermathecae after 15 days post-insemination.

Mechanisms Behind Reduced Fertility

• Analysis indicated no direct correlation between the number of received versus stored spermatozoids; however, increased mortality rates were observed post-migration into the spermathecae.

Conclusion: Urgency for Regulatory Attention

• There’s an urgent need for regulatory frameworks addressing pesticide toxicity effects on bee populations. Improved management practices are necessary to mitigate risks associated with chemical exposures affecting both male and queen fertility.

Discussion on Bee Breeding and Fertilization Techniques

Selection Against Varroa Mites

• The conversation begins with the importance of selecting bee strains resistant to Varroa mites, emphasizing natural selection elements in breeding practices.

• There is a noted trend in Germany towards discussing these selective approaches more openly within the beekeeping community.

Impact of Transportation on Queen Fertilization

• A question arises regarding whether transporting fertilized queens too close to insemination could induce stress, potentially raising hive temperatures and affecting fertilization quality.

• The speaker expresses skepticism about this concern, stating that they have not observed temperature increases impacting fertilization during frequent transportation before insemination.

Nutritional Strategies for Bee Colonies

• Discussion shifts to feeding strategies for bee colonies, particularly regarding pollen types and quantities suitable for Chamal bees.

• Various strategies are mentioned, including using previously collected pollen or commercial protein pastes; all seem effective based on shared experiences.

Hyperthermia Treatment Concerns

• The topic of hyperthermia treatment at 42 degrees Celsius is introduced as a potential risk factor for sperm viability in queens.

• While some acknowledge familiarity with this treatment, there is uncertainty about its effects on both queens and drones when applied during springtime.

Conclusion and Future Webinars

• The session concludes with an invitation to explore further studies by searching authors' names online for additional resources related to discussed topics.

• Upcoming webinars are announced, covering various aspects of queen fertilization control and seasonal management techniques.