Instrumental insemination of queen bees: protocol, equipment, success rates and UK rules

Instrumental insemination of queen bees means collecting semen from chosen drones and placing it, under a stereo microscope, into the oviducts of a virgin queen anaesthetised with carbon dioxide. It is the only method that gives complete certainty about the father of a colony. Done well, it produces queens that last and yield as well as open mated ones (Cobey, 2007). Done badly, it produces queens that the bees supersede within weeks. In the UK it is a specialist tool used by the National Bee Unit, a handful of bee farmers and breeders working on the native black bee or on Buckfast and Carniolan lines.

This guide assumes you can already graft larvae, run a cell raiser and manage mating nucs. If not, start with our guide to queen rearing.

Why do breeders use instrumental insemination?

A virgin queen mates in flight with a dozen or more drones, at drone congregation areas that may be several kilometres from her hive. DNA paternity work in two Peak District valleys found half of matings within 2.5 km of the mating apiary and 90% within 7.5 km, with one queen mating around 15 km away (Jensen et al., 2005). A ridge between valleys gave only partial isolation. In most of lowland England, where apiaries sit a few hundred metres apart, the beekeeper controls half of the genes in every daughter colony and leaves the other half to chance.

For a breeding programme that is a serious problem. In simulations by Plate and colleagues (2019), uncontrolled mating cut genetic progress by 47% to 99% compared with fully controlled mating, depending on the scenario. Selection still works with open mating, but slowly, and the gains are diluted every generation by local drones.

Insemination is used for:

• Pedigree selection: knowing both parents exactly, so breeding values can be estimated. Our page on honey bee genetics explains why this matters.
• Conservation: keeping lines of Apis mellifera mellifera as pure as possible, or maintaining a Buckfast or Carniolan line without regular imports. See our guide to honey bee breeds.
• Research: back crosses, inbred lines and single drone crosses. The NBU says on BeeBase that insemination has been one of its key skills for over 20 years, used principally for research, for example in the Waterloo funded “Queens project”, and also for training and breeding selected stocks.
• Weather independence: a wet, windy June does not stop a breeding programme when mating happens on the bench.

It does not replace selection. If you inseminate queens from an average colony with drones from average colonies, you get average bees with certified parents. The Defra minister Mary Creagh, answering a written question in July 2025, said that breeding varroa-tolerant bees is likely to be very difficult, because keeping resistance traits would need geographic isolation or artificial insemination together with large numbers of colonies to maintain genetic diversity.

Where did the technique come from?

Attempts to control honey bee mating date back to the 1700s, and mating in confinement still does not work (Cobey, 2007). The modern technique took shape in the United States between the late 1920s and the 1950s: Cobey (2007) describes it as developed in the 1920s and perfected in the 1940s and 1950s.

Year	Researcher	Contribution
1927	Lloyd R. Watson	reported controlled mating by insemination (“Controlled mating in the honey bee”, Iowa State Apiarist report), cited in the BEEBOOK
1947	Otto Mackensen	showed that CO2 treatment helps start egg laying
1948	Mackensen and Roberts	published a manual of the technique
1940s to 1950s	Harry H. Laidlaw and others	instruments and method perfected (Cobey, 2007)

The COLOSS BEEBOOK chapter (Cobey, Tarpy and Woyke, 2013), the international reference, notes that the basic technique has not changed significantly since the 1950s. Its protocols are illustrated with the Schley instrument and the Harbo syringe.

What equipment do you need, and what does it cost in the UK?

The BEEBOOK lists the basic kit:

• an instrument: base, queen holder tube, ventral and dorsal (sting) hooks or forceps, and a syringe with glass tips;
• a stereo microscope giving 10 to 20 times magnification, with a cold light source so the queen does not overheat;
• a CO2 supply: bottle or cartridges, regulator, flow control and tubing to the queen holder;
• queen cages, drone cages and a flight box in which drones can defecate before collection;
• sterile capillary tubes, 95% ethanol, a dilute sodium hypochlorite solution and an autoclave or pressure cooker for sterilising.

UK prices

Item	Price (October 2026)	Notes
Swienty complete set (apparatus, syringe, 5 glass tips, hooks, queen holder with CO2 valve, stereo microscope, cold light, CO2 fittings, wooden case)	£5,495 incl. VAT	UK stock; CO2 bottle not included
CO2 bottle	extra	from a gas or homebrew supplier
Glass tips, saline, sterile capillaries	consumables	budget for breakages in the first season

A second-hand instrument from a retiring breeder can be good value; check that the hooks are straight and that the syringe takes tips you can still buy.

How do you prepare drones and virgin queens in a British season?

Insemination makes you synchronise two kinds of maturity: a virgin queen of 5 to 12 days and a sexually mature drone. In the UK the window is set by drone production. Colonies raise plenty of drones from about late April in the south, with oil seed rape and fruit blossom, and drone numbers stay high through June. In the north and in Scotland everything runs two to four weeks later. Colonies throw drones out from late summer, earlier in a poor season, so most British breeders do all their inseminations between mid May and early August.

The timetable

The BEEBOOK, citing Woyke and Jasinski (1978), puts drone sexual maturity at 12 to 14 days after emergence, and recommends using only drones at least 14 days old. Many practitioners prefer drones of about three weeks. A drone takes 24 days from egg to emergence, so the drone comb must be laid at least 38 days before the planned session, and in practice one or two weeks earlier.

On the queen side, according to the University of Florida IFAS extension fact sheet on the European honey bee, a queen spends 3 days as an egg, 5.5 days as a larva and about 8 days as a pupa, so she emerges about 15 to 16 days after the egg was laid. If you graft day-old larvae, the virgin emerges 11 to 12 days later. To inseminate at 6 to 8 days old, graft 17 to 20 days before the session.

Task	Days before insemination
Insert drone comb or a drone foundation frame into drone colonies	45 to 52
Check drone brood is sealed	about 35 to 40
Graft larvae for the virgin queens	17 to 20
Place ripe queen cells into mating nucs, excluder on the entrance	8 to 10
First CO2 treatment of the virgins	1 to 2

The drones

The BEEBOOK recommends:

1. strong, well fed drone colonies, with plenty of pollen and, during the June gap, sugar syrup if the weather turns poor;
2. drone brood emerging above a queen excluder, or in a frame cage, so you can mark drones on emergence and know their age;
3. bringing only 100 to 150 drones per collection session of 30 to 40 minutes;
4. many more drones than you think you need, because some will not evert or will give too little semen.

Choose drones that try to fly or cling to the sides of the cage, and leave those that crawl on the floor. A short spell in a flight box lets drones void their faeces, which otherwise contaminate the semen. Keep varroa under control in drone colonies: mites prefer drone brood, and heavily infested drones are smaller and give poorer semen. Our guide to varroa mites covers monitoring and VMD authorised treatments.

The virgin queens

Virgins should emerge and live in well populated mating nucs, with queen excluder material over the entrance so that no virgin can fly out to mate. The BEEBOOK and later work agree that the size of the nuc matters: Otten and colleagues (1998, reported in Cobey’s review) obtained about 70% success and 12% queen losses in nucs of 200 workers, against about 95% success and under 1% losses in nucs of 1,200 workers. A two or three frame National or 14x12 nuc with sealed brood and stores is a safe base; tiny polystyrene mini-nucs are harder to manage around insemination.

Keep caging to a minimum. Workers grip the legs and feet of caged queens through the mesh, and injured queens are superseded more often. Cobey’s review reports that of 354 queens held a week in a queenless bank colony, 60% were injured, and cutting caging from 10 days to 4 days cut injuries from 54% to none.

Step-by-step: how to inseminate a queen bee

The protocol below follows the COLOSS BEEBOOK (2013), in a clean room at a steady temperature, with all equipment sterilised.

Before the session

1. Sterilise tips, hooks and syringe parts with heat or 95% ethanol, then rinse with sterile distilled water. Prepare a sterile saline: the BEEBOOK gives 0.9% sodium chloride with 0.1% glucose (its formula also adds an antibiotic), or the buffered diluent of Williams and Harbo. Some published diluents contain antibiotics; see the section on the law below before you use one.
2. First narcosis: give each virgin CO2 for 1 to 4 minutes one or two days before insemination. This is the first of the two CO2 treatments that switch her to egg laying.

Collecting semen

3. Fill the syringe with saline, then draw up a small air bubble to separate the saline from the semen.
4. Evert the drone in two steps: press the head and thorax, then squeeze the abdomen. A mature drone shows bright yellow-orange horns during partial eversion. The semen appears as a creamy, marbled tan layer on top of white mucus.
5. Draw up semen only, never the mucus, which sets and blocks the tip or the queen’s oviduct. A good drone gives about 1 µl.
6. Keep the tip wet with saline between drones: semen exposed to air dries and the sperm die.

Inseminating

7. Anaesthetise the queen in a slow, steady flow of CO2 and back her into the holder tube with the end of the abdomen exposed.
8. Open the sting chamber with the ventral hook and the dorsal hook or forceps. The vaginal opening, a “V” shape, and the valvefold become visible.
9. Set the angle of syringe and holder, typically 30 to 45 degrees depending on the instrument.
10. Insert the tip just above the “V” by 0.5 to 1 mm, then advance another 0.5 to 1 mm while easing the valvefold down with a slight zigzag motion. This is the step that bypasses the valvefold.
11. Inject slowly. If semen wells back around the tip, the tip is in front of the valvefold: withdraw and try again.
12. Dose: the standard dose is 8 to 12 µl. For 12 µl, the BEEBOOK describes either a single injection with prompt release into a nuc, or two doses of 6 µl 48 hours apart.
13. Mark the queen with the year colour or a numbered disc, and record her line, the drone source, the dose and the date.

An experienced operator can inseminate several queens an hour once drones and queens are ready. A beginner may manage one or two in a first session.

After insemination

14. Recover the queen somewhere warm and return her to her nuc promptly.
15. Keep the excluder on the entrance until eggs appear. This is not optional: Woyke and colleagues (1995, in Cobey’s review) found that 69% of queens inseminated at 6 days with 8 µl that were allowed to fly went on to mate naturally as well, against 29% of queens inseminated at 14 days.
16. Let the queen move freely. Sperm migrate from the oviducts to the spermatheca over the next day or two, and caging sharply reduces the number that arrive.

What the CO2 really does

CO2 is not just an anaesthetic. Mackensen showed in 1947 that it triggers egg laying: without a second narcosis, inseminated queens took 40 to 60 days longer to start laying (Cobey, 2007). The usual routine is one narcosis a day or two before insemination and the second during insemination itself. The cost appears late: in Konopacka’s Polish study reported by Cobey, the shorter life of CO2 treated queens became visible only after their third year.

How is drone semen stored and frozen?

Short-term storage

According to the BEEBOOK, fresh semen keeps for several weeks in sealed capillary tubes, in the dark at about 20 °C.

Mixing semen from many drones

To give a group of queens the same representative mix of drones, the BEEBOOK describes diluting semen in about 10 volumes of diluent, then centrifuging it at an angle of 45°, for example 82 g for 20 to 30 minutes, to concentrate the sperm again. Centrifuging kills a share of the sperm, but a viability of around 50% is still enough for normal brood (Collins, 2000, cited in the BEEBOOK).

Cryopreservation

Freezing follows a principle close to that used for livestock: a cryoprotectant (DMSO or ethylene glycol), slow cooling at about 3 °C a minute from 4 °C to -40 °C, then storage in liquid nitrogen, and thawing at 40 °C for 10 seconds (BEEBOOK).

Results show a biological success, not yet a practical one:

• Hopkins, Herr and Sheppard (2012) at Washington State University inseminated queens with frozen semen; some produced a substantial number of fertilised offspring, and the team raised two further generations of queens and back crossed them to the same stock.
• Egyptien and colleagues (2025) at the University of Liège tested a simple, antibiotic-free protocol with 10% DMSO and egg yolk. Sperm viability averaged 85% in fresh semen and 48% after freezing and thawing. Of 16 queens inseminated with thawed semen, 8 laid and 5 produced worker brood, against 5 and 3 of 13 queens given fresh semen. The numbers are small and no statistical test was possible.

The BEEBOOK concludes that thawed semen is fertile enough to carry a line through generations of queens but not to head reliable production colonies. For Britain and Ireland, where groups are trying to conserve local Apis mellifera mellifera populations, a frozen semen bank is a long-term insurance policy rather than a source of honey production queens.

Are inseminated queens as good as naturally mated queens?

The reputation of the “fragile inseminated queen” is persistent. Susan Cobey’s review, which compiles comparisons published since 1946, finds it unjustified. Selected studies from her review:

Study	Queens (II / natural)	Result
Roberts, 1946 (USA)	65 / 43	honey 95.3 kg vs 52.6 kg
Woyke and Ruttner, 1976	15 / 72	honey 54 kg vs 39 kg
Vesely, 1984	672 / 1,483	honey +8%; survival 50% vs 58% in year one, 27% vs 15% in year two
Harbo and Szabo, 1984	59 / 59	honey 42.3 kg vs 75 kg; first year survival 31% vs 58%
Konopacka, 1987 (Poland)	276 / 285	survival 94% vs 98% in year one, 54% vs 87% in year two
Cobey, 1998	14 / 12	colony weight 109.8 kg vs 114.6 kg; mean survival 18 months in both groups
Cermák, 2004 (Czech Republic)	612 / 137	honey 21.3 kg vs 19.4 kg; in a further 233 / 50 queens, lifespan 23.4 vs 21.5 months

The one clearly unfavourable study, Harbo and Szabo, is revealing: queens were inseminated at 2 to 3 weeks old, with two small doses of 2.7 µl, then held in a bank for 2 to 3 weeks. Cobey’s conclusion is that how queens are handled weighs more than the act of insemination.

Sperm in the spermatheca

Naturally mated queens carry on average about 5.7 million sperm in the spermatheca (Mackensen, 1964). Inseminated queens that were caged after insemination stored about 1.8 million, against 5.2 million for queens left free (Woyke, 1989). Below about 4 million sperm, queens tend to be superseded early (Harizanis and Gary, 1984; Woyke, 1989). That threshold explains most “inseminated queens that do not last”: they were under-dosed or caged, not damaged by the method.

Onset of laying and introduction

Inseminated queens start laying later than open mated ones: in Wilde’s work (1994) cited by Cobey, 10 to 37 days after emergence against 7 to 26 days. The BEEBOOK adds that their full pheromone profile develops more slowly. Introduced too soon to a strong production colony, they risk being superseded or balled. Let an inseminated queen lay for a few weeks in her nuc, then build the nuc up or unite it, rather than running her straight into a full brood box of a National hive. The Polish experience below makes the same point. Our page on the queen bee explains how sperm storage and laying work.

Why do inseminations fail?

The factors identified in the literature:

• Queen age: the BEEBOOK optimum is 5 to 12 days; queens inseminated before 4 days old die more often.
• Drones: drone quality is a leading cause of failure. Age, nutrition, varroa, pesticide exposure and the weather all affect semen. Semen from drones over four weeks old more often leaves residue in the oviducts (Cobey, 2007).
• Operator: a tip placed in front of the valvefold causes backflow and under-dosing. Tip size matters too: in Bieńkowska and Panasiuk’s 2006 comparison, 0.16 mm tips left 3.3 million sperm in the spermatheca against 2.6 million for 0.19 mm tips.
• Caging and banking: see the injury figures above.
• Nuc strength: small nucs lose more queens.

Published success rates

Series	Queens	Success
Mackensen, 1964-1966 (USA)	759	92.5%
Kirchhain (Germany), 1972 and 1973	1,480	76.8% and 83.5%
Moritz and Kühnert, 1972-1983	3,440	90%
Skowronek et al., 2002 (Poland)	1,289	90.4% laying within 15 days

All of these come from established stations, and all before 2005, as reported by Cobey. We know of no recent UK figures. Failures are rarely published, and a first-season operator in Britain should expect far lower results. Commercial producers discard queens that are not laying within about three weeks (Cobey, 2007).

Single drone or multiple drones?

Single drone insemination uses semen from one drone, about 1 µl. All the workers are then super-sisters, related by 75%, which makes them ideal for testing a sire or fixing a trait.

Du, Bernstein and Hoppe (Hereditas, 2024) simulated 20 years of BLUP-style breeding with 1 to 50 drones per queen:

• single drone insemination gave 5.46% to 14.19% more genetic progress than multiple drone insemination, at the cost of 6.1% to 30.2% more inbreeding;
• with multiple drones, the number made little difference; above five drones the differences were no longer significant;
• one drone does not fill the spermatheca, so a single drone queen may not head a full strength colony.

In a small British breeding group with a closed population, single drone work also speeds up the loss of csd sex alleles, giving the patchy brood of inbred stock. Keep single drone queens for testing, and use multiple drone doses of 8 to 12 µl for breeder and production queens.

What can a country achieve with insemination? The Polish example

Poland is the one country where inseminated queens are used routinely in production colonies. Cobey, Bieńkowska, Wilde and Gąbka (American Bee Journal, 2019) describe:

• 50,000 to 80,000 inseminated queens sold every year;
• more than 95% of breeding apiaries (72 are named) using insemination;
• one breeding centre producing 20,000 inseminated queens a year;
• more than 500 certified technicians, about fifty of them active;
• state support for around 150,000 certified queens a year since the late 1990s, with inseminated queens eligible only once installed and laying for two weeks.

Their early mistake is worth remembering: queens sold before they had started laying and introduced straight into strong colonies were often rejected. Establishing non-laying queens in nucs first greatly increased their success.

The UK has nothing on that scale. Selection here relies mostly on local association groups, isolated mating sites and drone flooding, with insemination used by the NBU, by some bee farmers and by breeders of Buckfast, Carniolan and native black bee lines. BIBBA, which promotes the native Apis mellifera mellifera of Britain and Ireland, supports local and regional mating stations and opposes imports of queens and packages from outside the British Isles and Ireland. Bee farmers have also invested in the skill: the Queen Elizabeth Scholarship Trust funded a Northumberland bee farming apprentice in 2019 to take advanced courses in queen insemination.

The law in the UK: imports, medicines and the devolved nations

We found no UK legislation that licenses or restricts instrumental insemination as such. The rules that matter are the general ones on bee health, imports and medicines.

Notifiable diseases and registration

American foulbrood, European foulbrood, small hive beetle and Tropilaelaps mites are notifiable under the Bee Diseases and Pests Control Orders. Report suspicion to the National Bee Unit or your local bee inspector in England and Wales, to the Scottish Government’s Bee Inspectors in Scotland (samples are analysed by SASA), or to DAERA in Northern Ireland. Breeders swap queens, drones and semen, so a breeding apiary should be registered on BeeBase, or with DAERA in Northern Ireland: registration is voluntary but lets inspectors warn you of disease nearby. Our page on how to register your bees explains the process.

Importing queens and semen

According to the NBU’s 2026 guidance for importers and the Scottish Government:

• From the EU, Great Britain accepts queens only, each in a single cage with no more than 20 attendants, with an original Model QUE health certificate and prior notification through IPAFFS. Calabria and Sicily cannot export under safeguard measures.
• From outside the EU, only queens and attendants from listed countries, through a border control post, with at least one working day’s notice on IPAFFS. New Zealand may also send packages.
• On arrival, move each queen to a new cage and send the original cages, attendants and packaging within five days to the import address at York Biotech Campus, Sand Hutton (Fera), or to SASA in Edinburgh for Scotland, to be checked for small hive beetle and Tropilaelaps.
• Northern Ireland applies EU animal health rules; follow DAERA guidance.

The NBU guidance does not mention drone semen or other germinal products, and we found no published UK import procedure specific to honey bee semen. If you plan to import semen, ask APHA, or the Scottish Government for Scotland, before you order: do not assume that it is either allowed or exempt.

Colonsay and Oronsay

Under the Bee Keeping (Colonsay and Oronsay) Order 2013, it has been an offence since 1 January 2014 to keep any honey bee other than Apis mellifera mellifera on those Scottish islands. Queens inseminated with non-native drones cannot go there.

Antibiotics in semen diluents

Some diluents published in the BEEBOOK contain antibiotics, such as dihydrostreptomycin in the Williams and Harbo formula, or penicillin and streptomycin in storage diluents. In the UK, according to the NBU’s bee medicines fact sheet (June 2025), any product used on honey bees must be authorised under the Veterinary Medicines Regulations 2013 unless a veterinary surgeon prescribes it, and home made or unauthorised preparations are an offence. The VMD product database lists what is authorised for honey bees, and none of those products is a semen diluent. Our reading, not an official position, is that adding an antibiotic to a diluent needs a vet’s prescription. The simple alternative is to work without antibiotics and with strict hygiene: the Liège team obtained worker brood from frozen semen stored without antimicrobials. Records of any medicine bought, used or disposed of should be kept for at least five years.

How can you learn instrumental insemination in the UK?

Insemination is learned hands-on and consolidated over several seasons. Realistic routes:

1. Master queen rearing first. You need a reliable supply of virgins of known age and of marked drones of known age on the same day. The NBU’s queen rearing pages on BeeBase are the place to start.
2. Join a bee improvement group. BIBBA groups and local association breeding groups run the records, mating sites and drone colonies that make insemination worthwhile.
3. Take a course. We found no regular public course advertised in the UK for 2026; British beekeepers mostly train with experienced breeders, through bee farming networks or on courses abroad. Before booking, check how many queens you will inseminate yourself and whether you must bring your own virgins and drones.
4. Work alongside an operator. Many bee farmers learned by inseminating their own queens next to an experienced inseminator for a season before buying a kit.

Keep a record for every queen: age at insemination, dose, number of narcoses, date of first eggs, brood pattern and fate. Expect low success in your first year, and judge the method on the second.

For the rest of the breeding toolkit, from grafting to genetics, see our breeding section.

Frequently asked questions

At what age should a virgin queen be inseminated?

The COLOSS BEEBOOK standard methods recommend 5 to 12 days after emergence. Queens inseminated before 4 days old die more often, and older queens are more likely to have started mating flights if they were not kept behind queen excluder material. Most operators aim for 6 to 10 days, which in a British June means grafting about 17 to 20 days before the planned session.

How many drones do you need to inseminate one queen?

A mature drone gives roughly 1 µl of semen, and the standard dose is 8 to 12 µl, so plan on about ten drones that evert fully for each queen. In practice you need several times that number in the flight box, because many drones evert only partly or give too little. Bring 100 to 150 marked drones per collection session of 30 to 40 minutes.

Do inseminated queens live as long as naturally mated queens?

They can. Susan Cobey's 2007 review in Apidologie found studies in which survival and honey yield were equal, others in which inseminated queens did better, and one clearly worse result, explained by late insemination, tiny doses and weeks in a queen bank. Most short-lived inseminated queens were badly handled, under-dosed or introduced too early to a strong colony.

What success rate can I expect from instrumental insemination?

Large published series from experienced stations report 77% to 92% of queens laying, and a Polish series of 1,289 queens reached 90.4% laying within 15 days. Beginners should expect much lower figures in their first season. Most failures come from immature or poorly fed drones, underweight mating nucs, too much caging and poor tip placement, not from the insemination itself.

How much does queen insemination equipment cost in the UK?

A complete Swienty set with apparatus, syringe, hooks, stereo microscope, cold light and CO2 fittings was listed by a UK stockist at £5,495 including VAT in October 2026, without the CO2 bottle. Buying the instrument alone means adding a microscope, a regulator, glass tips and shipping. Second-hand kits appear occasionally through bee farmer networks.

Do I need a licence to inseminate queen bees in the UK?

We found no UK law that licenses instrumental insemination itself. General rules still apply: imported queens must meet the IPAFFS and cage examination rules, notifiable diseases must be reported, and any medicine you use on bees, including an antibiotic in a semen diluent, must be authorised by the VMD or prescribed by a veterinary surgeon. On Colonsay and Oronsay only Apis mellifera mellifera may be kept.

Can drone semen be frozen?

Yes, in liquid nitrogen with DMSO or ethylene glycol as a cryoprotectant, but thawed semen is less fertile. Washington State University has raised successive generations of queens from frozen semen, while in a 2025 Belgian study sperm viability averaged 85% in fresh semen and 48% after thawing. Frozen semen is a gene bank tool for conserving lines, not a way to produce reliable production queens.

Sources

1. Comparison studies of instrumentally inseminated and naturally mated honey bee queens and factors affecting their performance (Apidologie, 38, 390-410, 2007), Susan W. Cobey, Apidologie (INRA/DIB-AGIB/EDP Sciences)
2. Standard methods for instrumental insemination of Apis mellifera queens (Journal of Apicultural Research, 52(4), 2013, The COLOSS BEEBOOK), Susan W. Cobey, David R. Tarpy, Jerzy Woyke, IBRA
3. Sequential generations of honey bee (Apis mellifera) queens produced using cryopreserved semen (Reproduction, Fertility and Development, 24(8), 1079-1083, 2012), B. K. Hopkins, C. Herr, W. S. Sheppard, CSIRO Publishing
4. Evaluation of a Simple Antibiotic-Free Cryopreservation Protocol for Drone Semen (Insects, 16(1), 50, 2025), S. Egyptien et al., University of Liège, MDPI
5. The number of drones to inseminate a queen with has little potential for optimization of honeybee breeding programs (Hereditas, 161, 2024), M. Du, R. Bernstein, A. Hoppe, BioMed Central, via DOAJ
6. The importance of controlled mating in honeybee breeding (Genetics Selection Evolution, 51, 74, 2019), M. Plate, R. Bernstein, A. Hoppe, K. Bienefeld, BioMed Central
7. Poland: the only country where instrumentally inseminated queens are routinely used in commercial production colonies (March 2019), S. Cobey, M. Bieńkowska, J. Wilde, J. Gąbka, American Bee Journal
8. Mating nucs and artificial insemination, National Bee Unit, APHA (BeeBase)
9. Guidance for importers of honey bees (2026), National Bee Unit, APHA
10. Imports and exports of honey bees, National Bee Unit, APHA (BeeBase)
11. Importing bees into Scotland: guidance, Scottish Government
12. Bee medicines fact sheet (June 2025), National Bee Unit, APHA
13. The Bee Keeping (Colonsay and Oronsay) Order 2013 (SSI 2013/279), legislation.gov.uk
14. Bees: animal breeding, written question 69138, answered 25 July 2025, UK Parliament, written questions and answers
15. Quantifying honey bee mating range and isolation in semi-isolated valleys by DNA microsatellite paternity analysis (Conservation Genetics, 2005), Jensen et al., Royal Holloway repository
16. BIBBA aims, Bee Improvement and Bee Breeders' Association (BIBBA)
17. Anna Robson, QEST Garfield Weston Foundation apprentice in bee farming (2019), Queen Elizabeth Scholarship Trust (QEST)
18. Swienty insemination apparatus complete set (price checked October 2026), Simon the Beekeeper