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Instrumental insemination of honey bee queens: protocol, equipment, success rates and US rules

Instrumental insemination of honey bee queens in the US: step-by-step protocol, doses, CO2, courses and costs in $, success rates, frozen semen and USDA rules.

Instrumental insemination of honey bees, usually shortened to II, is the technique of collecting semen from selected drones and injecting it, under a stereo microscope, into the oviducts of a virgin queen anesthetized with carbon dioxide. It is the only way to know the father of a colony for certain. Done well, it produces queens that live and produce as well as open-mated queens (Cobey, 2007); done badly, it produces queens that are superseded within weeks. In the United States, II is how breeder queens for mite-resistance programs such as VSH and Pol-line are produced, and how semen imported from Europe and Central Asia reaches American colonies.

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

Why do US breeders use instrumental insemination?

A virgin queen mates in flight with a dozen or more drones at drone congregation areas that can be miles from her hive. In most of the country, where several beekeepers keep bees within flight range, you control the mother of every daughter colony and leave the father to chance. In the South and Southwest, chance can also mean Africanized drones: USDA-ARS reports that European queens mate disproportionately with African drones, and that defensiveness is among the genetically dominant African traits (Kaplan, Agricultural Research, 2004).

For a breeding program, uncontrolled mating is costly. In simulations by Plate and colleagues (2019), it cut genetic progress by 47% to 99% compared with fully controlled mating. II removes the problem completely, which is why it matters for:

  • Selection on pedigree: estimating breeding values requires knowing both parents. Our page on honey bee genetics explains why.
  • Mite-resistance breeding: John Harbo and Jeffrey Harris at the USDA-ARS lab in Baton Rouge estimated a heritability of 0.46 for suppression of mite reproduction using groups of queens inseminated with semen from the same sire colony (1999). That work led to Varroa Sensitive Hygiene (VSH) stock.
  • Bringing in new genetics: the US gene pool has been largely closed to live bee imports since 1922, so new European material arrives as semen.
  • Africanized areas: on the bench, the drones are exactly the ones you chose.
  • Research: back crosses, inbred lines and single-drone crosses.

II does not replace selection. Inseminating queens from an average colony with drones from average colonies gives you average bees with certified parents.

A short history of II

The modern technique was largely developed in the United States:

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 by Susan Cobey, David Tarpy and Jerzy Woyke (2013), the international reference, notes that the basic technique has not changed significantly since the 1950s. Its protocols are illustrated with a Schley instrument and a Harbo syringe.

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

The BEEBOOK lists the basics:

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

US prices are hard to pin down, because most instruments come from a few specialist makers in the US and Europe and are sold on request. Two published reference points help with budgeting:

Item Price Source
Purdue two-day II course (three places) $1,000 per student, $200 deposit to book Purdue Entomology
Instrument rental for the Purdue course $150 Purdue Entomology
Microscope rental for the Purdue course $50 Purdue Entomology
II Caucasian breeder queen $1,000 WSU store listing (2018 page)

Purdue strongly encourages students to bring their own equipment, which tells you most serious breeders buy a kit after training. Budget several thousand dollars for an instrument, microscope and CO2 setup, and add tips, saline and capillaries as consumables. A used kit from a retiring breeder can be good value if the hooks are straight and the syringe takes tips you can still buy.

How do you prepare drones and virgin queens?

II forces you to line up two kinds of maturity on the same day: a virgin queen of 5 to 12 days and a sexually mature drone.

Regional timing

The season is set by drone production, which varies widely across the country:

  • South and Gulf Coast (Florida, Georgia, Louisiana, Texas): colonies rear drones from late winter, so II can start in early spring; summer heat and dearth can cut drone quality.
  • California: drones build up with almond bloom and spring forage, and most commercial queen rearing happens from early spring.
  • Midwest and Northeast: drones are reliably available from about May to August.
  • Pacific Northwest: a later start and a dry late summer; WSU ships its II breeder queens from July to September.

Wherever you are, start when your drone colonies have sealed drone brood, not by the calendar.

The timetable

The BEEBOOK, citing Woyke and Jasinski (1978), puts drone maturity at 12 to 14 days after emergence and recommends using only drones at least 14 days old. A drone takes 24 days from egg to emergence, so drone comb must be laid at least 38 days before insemination day, and in practice one or two weeks earlier.

For the queen, the University of Florida IFAS fact sheet on the European honey bee gives 3 days as an egg, 5.5 days as a larva and about 8 days as a pupa, about 15 to 16 days in all. A queen grafted as a young larva 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
Put drone comb into selected drone colonies 45 to 52
Check that drone brood is capped about 35 to 40
Graft larvae for the virgins 17 to 20
Place ripe cells in mating nucs, excluder over 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, fed syrup and pollen substitute during a dearth;
  2. drones emerging above a queen excluder or in a frame cage, marked at emergence so their age is known;
  3. only 100 to 150 drones per 30 to 40 minute collection session;
  4. many more drones than you think you need.

Pick drones that try to fly or cling to the cage walls, and skip those crawling on the floor. A short flight in a flight box lets them void feces that would otherwise contaminate the semen. Keep mites low in drone colonies: varroa prefers drone brood. Our guide to varroa mites covers alcohol washes and EPA-registered treatments.

The virgin queens

Virgins should emerge in well-populated mating nucs with queen excluder over the entrance so none can fly out to mate. Nuc size matters: Otten and colleagues (1998, reported by Cobey) saw about 70% success and 12% queen losses in nucs of 200 workers, against about 95% success and under 1% losses with 1,200 workers. A two- to three-frame nuc of deep or medium Langstroth frames with capped brood and stores is a safe base.

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

Step-by-step instrumental insemination protocol

This protocol follows the COLOSS BEEBOOK (2013). Work in a clean room at a stable temperature with sterilized equipment.

Before the session

  1. Sterilize tips, hooks and syringe parts with heat or 95% ethanol, then rinse with sterile distilled water. Prepare 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 rules section below. Diluent chemistry is not a detail: a 2025 USDA SARE project in North Dakota reported high mortality of newly inseminated queens after a supplier error left a diluent at the wrong pH.
  2. First narcosis: give each virgin CO2 for 1 to 4 minutes, one or two days before insemination.

Collecting semen

  1. Fill the syringe with saline, then draw up a small air bubble to separate saline from semen.
  2. Evert the drone in two steps: press the head and thorax, then squeeze the abdomen. A mature drone shows bright yellow-orange horns on partial eversion. Semen is a creamy, marbled tan layer sitting on white mucus.
  3. Take up semen only, never mucus, which sets and plugs the tip or the queen’s oviduct. A good drone gives about 1 µl.
  4. Keep the tip wet with saline between drones; semen exposed to air dries out.

Inseminating

  1. Anesthetize the queen in a slow, steady CO2 flow and back her into the holder tube with the tip of the abdomen exposed.
  2. Open the sting chamber with the ventral hook and the dorsal hook or forceps until the “V” of the vaginal opening and the valvefold are visible.
  3. Set the angle of syringe and holder, usually 30 to 45 degrees.
  4. Insert the tip just above the “V” by 0.5 to 1 mm (about 1/50 to 1/25 in), then advance another 0.5 to 1 mm while easing the valvefold down with a slight zigzag.
  5. Inject slowly. Semen flowing back around the tip means it sits in front of the valvefold: withdraw and try again.
  6. 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 6 µl doses 48 hours apart.
  7. Mark the queen with the year color or a numbered tag, and record her line, drone source, dose and date.

After insemination

  1. Let the queen recover somewhere warm and return her to her nuc promptly.
  2. Keep the entrance excluder in place until eggs appear. Woyke and colleagues (1995, in Cobey’s review) found that 69% of queens inseminated at 6 days with 8 µl that were free to fly also mated naturally, against 29% of queens inseminated at 14 days. In an Africanized area, that leak would undo the whole point.
  3. Leave the queen free on the comb: sperm migrate to the spermatheca over the next day or two, and caging sharply reduces how many arrive.

Why CO2 matters

CO2 is more than an anesthetic. Mackensen showed in 1947 that it triggers egg laying: without a second narcosis, inseminated queens started laying 40 to 60 days later (Cobey, 2007). The standard routine is one narcosis a day or two before insemination and the second during it. In Konopacka’s Polish study cited by Cobey, a shorter life in CO2-treated queens showed up only after the third year.

How is drone semen stored, shipped and frozen?

Fresh semen

According to the BEEBOOK, fresh semen keeps for several weeks in sealed capillary tubes, in the dark at about 68°F (20°C). Breeders use this to collect from a sire colony in one yard and inseminate in another, or to ship semen to a cooperating breeder.

Homogenized semen

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 a 45° angle, for example at 82 g for 20 to 30 minutes. Centrifuging kills some sperm, but about 50% viability is enough for normal brood (Collins, 2000, cited in the BEEBOOK).

Frozen semen and the WSU repository

Cryopreservation uses a cryoprotectant (DMSO or ethylene glycol), slow cooling of about 5.4°F (3°C) a minute from 39°F (4°C) to -40°F (-40°C), storage in liquid nitrogen, and thawing at 104°F (40°C) for 10 seconds (BEEBOOK).

Washington State University leads this work in the US. According to WSU in 2016, it received a USDA permit to import honey bee semen in 2008, held what it called the only such permit, had imported semen from Italy, Slovenia, the Republic of Georgia and Kazakhstan, and stores it in liquid nitrogen at -321°F (-196°C) in what it then described as the only bee germplasm repository in the world. Hopkins, Herr and Sheppard (2012) showed that some queens inseminated with frozen semen produced a substantial number of fertilized offspring, and the team raised two further generations of queens and back crossed them to the same stock.

Fertility remains the limit. In a 2025 University of Liège study testing a simple, antibiotic-free protocol with 10% DMSO and egg yolk, sperm viability averaged 85% in fresh semen and 48% after freezing and thawing; 8 of 16 queens given thawed semen laid and 5 produced worker brood, against 5 and 3 of 13 queens given fresh semen. The BEEBOOK concludes that thawed semen can carry a line through generations of queens but not head productive colonies. In practice, imported frozen semen is used to inseminate breeder queens whose daughters then go into regular mating yards.

Are II queens as good as open-mated queens?

The idea that “II queens don’t last” is widespread. Susan Cobey’s review of comparisons published since 1946 finds it unjustified. Selected studies, with weights converted from her review:

Study Queens (II / natural) Result
Roberts, 1946 (USA) 65 / 43 honey 210 lb vs 116 lb (95.3 vs 52.6 kg)
Woyke and Ruttner, 1976 15 / 72 honey 119 lb vs 86 lb (54 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 93 lb vs 165 lb (42.3 vs 75 kg); year-one survival 31% vs 58%
Nelson and Laidlaw, 1988 19 / 20 honey 176 lb vs 154 lb (80 vs 70 kg)
Cobey, 1998 14 / 12 mean survival 18 months in both groups
Cermák, 2004 (Czech Republic) 612 / 137 honey 47 lb vs 43 lb (21.3 vs 19.4 kg); in a further 233 / 50 queens, lifespan 23.4 vs 21.5 months

The clearly unfavorable study, Harbo and Szabo, is instructive: queens were inseminated at 2 to 3 weeks old with two small doses of 2.7 µl, then banked for 2 to 3 weeks. Cobey concludes that queen handling matters more than the act of insemination.

Sperm counts

Naturally mated queens carry on average about 5.7 million sperm (Mackensen, 1964). II queens 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 short-lived II queens.

Introduction

II queens start laying later than open-mated ones: 10 to 37 days after emergence against 7 to 26 days in Wilde’s work (1994), cited by Cobey. The BEEBOOK adds that their full pheromone profile develops more slowly. That is why WSU strongly recommends experience in introducing II queens. Let an II queen lay for a few weeks in a nuc, then build it up or combine it, rather than dropping her straight into a strong double-deep colony. Our page on the queen bee explains sperm storage and laying.

Why do inseminations fail?

What the research points to:

  • Queen age: 5 to 12 days is the BEEBOOK optimum; queens inseminated before 4 days old die more often.
  • Drones: age, nutrition, mites, pesticide exposure and weather all affect semen. Semen from drones over four weeks old more often leaves residue in the oviducts (Cobey, 2007).
  • Operator: a tip in front of the valvefold causes backflow and under-dosing. Tip size counts: in Bieńkowska and Panasiuk’s 2006 comparison, 0.16 mm tips left 3.3 million sperm in the spermatheca against 2.6 million with 0.19 mm tips.
  • Caging and banking, and nuc strength: see above.
  • Diluent: as the North Dakota SARE project found, a bad batch can kill a whole session’s 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

These come from experienced stations, all before 2005, as reported by Cobey. We know of no recent nationwide US figures, and failures are rarely published. Commercial producers cull queens not laying within about three weeks (Cobey, 2007).

Single-drone or multiple-drone insemination?

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

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, at the cost of 6.1% to 30.2% more inbreeding;
  • with multiple drones the number made little difference, and 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.

Colony performance also depends on diversity. Heather Mattila and Thomas Seeley at Cornell compared colonies headed by queens inseminated with 15 drones against queens inseminated with one (Science, 2007). According to Cornell, within two weeks the diverse colonies had built about 30% more comb and stored 39% more food; by the end of winter 25% of the diverse colonies reached their first anniversary, while every single-drone colony starved.

The practical rule: single-drone queens for testing and research, multiple-drone doses of 8 to 12 µl for breeder queens.

Who uses II in the US, and what can it achieve?

Breeding programs and producers

In the US, II sits at the top of a pyramid. A small number of breeder queens are inseminated each year, then commercial queen producers graft thousands of daughters from them and open-mate those daughters in yards saturated with selected drones. VSH, Pol-line and other mite-resistance breeder stocks are produced this way, as are university programs such as WSU’s. Small producers are joining in: a 2025 USDA SARE farmer grant of $30,000 funds a North Dakota queen breeder and a Missouri VSH producer exchanging virgins to cross Carniolan and VSH lines by II, then scoring the colonies with the Harbo mite reproduction assay.

Where Africanized bees are present, states add rules for queen producers. Florida’s rule 5B-54.0105 incorporates the Honey Bee Queen Compliance Agreement (FDACS-08419). The current version (Rev. 01/18) requires at least 60 European drone source colony equivalents per 1,000 or fewer mating nuclei, 75% of them within a quarter-mile (about 400 m) of the mating yard and the rest within one mile, drone semen for II taken only from drones of European queens, and records of all sales of queens, drones and drone semen. Rules differ by state, so check with your state apiarist or department of agriculture. Our page on beekeeping laws by state has the contacts.

The Polish comparison

Only Poland uses II queens routinely in production colonies. Cobey, Bieńkowska, Wilde and Gąbka (American Bee Journal, 2019) report 50,000 to 80,000 II queens sold each year, II used in more than 95% of breeding apiaries, and state support for around 150,000 certified queens a year, with II queens eligible only once installed and laying for two weeks. Their early mistake mirrors the American advice: queens sold before laying and introduced straight into strong colonies were often rejected, and a spell in a nuc fixed it.

US rules: imports, state laws and antibiotics

We found no federal or state law that licenses instrumental insemination itself. The rules that matter are those on imports, colony registration and drugs.

Importing semen and queens

Under the bee regulations in 7 CFR part 322, USDA APHIS allows adult queens and package bees into the continental US only from Canada and New Zealand; imports from Australia are prohibited, and bees may not be imported or moved interstate into Hawaii. For germplasm, APHIS lists Australia, Bermuda, Canada, France, Great Britain, New Zealand and Sweden as countries from which it may be imported under set conditions. From any other country, germplasm is a restricted article, importable only for university or state and federal government research with a PPQ 526 permit, red-and-white PPQ 599 labels and routing through an inspection station. That is the route WSU uses for semen from Italy, Slovenia, Georgia and Kazakhstan.

State apiary laws

Many states require colony registration, and some require inspection or permits to sell or move queens. Check your state department of agriculture before selling II queens or shipping semen across state lines.

Antibiotics in diluents

Some BEEBOOK diluents contain antibiotics, such as dihydrostreptomycin in the Williams and Harbo formula, or penicillin and streptomycin in storage diluents. According to the FDA’s Center for Veterinary Medicine, the antimicrobials approved for honey bees are oxytetracycline, tylosin and lincomycin, sold as VFD or prescription products that must be used by or on the order of a licensed veterinarian, and extralabel use of a prescription drug requires a valid veterinarian-client-patient relationship. None of those approvals covers a semen diluent. Our reading, not an FDA position, is that adding an antibiotic to a diluent needs a veterinarian’s involvement. Many operators simply work antibiotic-free with strict hygiene; the Liège team got worker brood from semen frozen without antimicrobials.

How do you learn instrumental insemination?

II is learned hands-on and refined over several seasons. In 2026:

  • Purdue University ran its two-day Advanced Techniques in Instrumental Insemination course on September 3 and 4, for three students at $1,000 each ($200 deposit), taught by apiculture specialist Krispn Given with Dale McMahan; it filled, and requires successful queen and drone rearing experience.
  • UF/IFAS Honey Bee Research and Extension Laboratory in Gainesville hosted a two-day workshop in March with Purdue and Apis Engineering for 10 beekeepers; the university noted that such courses typically take only one to four students, and 80% of participants said they would use II in their breeding.

Check your own state’s land-grant university extension service and state beekeepers association for courses closer to home. Then practice: keep a record for every queen, with age at insemination, dose, number of narcoses, date of first eggs, brood pattern and fate. Expect low success in your first season and judge the method on the second.

For grafting, drone colonies and genetics, see our breeding section.

Frequently asked questions

How old should a virgin queen be for instrumental insemination?

The COLOSS BEEBOOK standard methods recommend inseminating 5 to 12 days after emergence. Queens inseminated before 4 days old die more often, and queens left with an open entrance may already have taken mating flights. Most operators aim for 6 to 10 days. Since a queen emerges about 11 to 12 days after grafting a young larva, graft roughly 17 to 20 days before your insemination day.

How many drones does it take to inseminate a queen?

A mature drone yields about 1 µl of semen, and the standard dose is 8 to 12 µl, so you need roughly ten drones that evert fully per queen. Bring far more than that: the BEEBOOK suggests 100 to 150 marked drones per 30 to 40 minute collection session, because many drones evert only partly or give too little semen.

Are instrumentally inseminated queens as good as open-mated queens?

Properly produced, yes. Susan Cobey's 2007 review in Apidologie found studies where survival and honey yield were equal and others where inseminated queens did better. The one clearly poor result came from queens inseminated late, with tiny doses, and kept caged for weeks. Most II queens that fail early were under-dosed, caged too long or introduced to a big colony before they were laying well.

How much does an instrumentally inseminated queen cost?

Far more than a production queen. A Washington State University store listing for instrumentally inseminated Caucasian breeder queens, dating from 2018 according to its web address, prices them at $1,000 each, prepaid by June 1 and shipped July to September, and strongly recommends experience introducing II queens. II queens are for breeding programs, not for requeening every hive.

Where can I learn instrumental insemination in the US?

Several land-grant universities teach it. Purdue's two-day Advanced Techniques in Instrumental Insemination course in September 2026 cost $1,000 per student, took three students and was full, with instruments for rent. In March 2026 the University of Florida IFAS honey bee lab, Purdue and Apis Engineering trained ten beekeepers in Gainesville. You need solid queen and drone rearing skills first.

Can I import honey bee semen into the United States?

Only under USDA APHIS rules. APHIS lists Australia, Bermuda, Canada, France, Great Britain, New Zealand and Sweden as countries from which germplasm may be imported under set conditions; from anywhere else it is a restricted article, limited to university or state and federal research under a PPQ 526 permit. Washington State University has held a USDA semen import permit since 2008 and in 2016 described it as the only one issued.

Can drone semen be frozen and used later?

Yes. Washington State University stores imported semen in liquid nitrogen at -321°F (-196°C) and has raised successive generations of queens from frozen semen. Thawed semen is less fertile, though: in a 2025 Belgian study sperm viability averaged 85% fresh and 48% after thawing. Frozen semen conserves genetic lines; it is not yet a reliable way to produce queens for honey colonies.

Do I need a permit to inseminate my own queens?

We found no federal or state rule that licenses instrumental insemination itself. The general rules still apply: register your colonies and get any permits your state requires, follow state rules on moving or selling queens, and remember that antibiotics such as those in some semen diluents are medically important drugs that beekeepers can use only by or on the order of a licensed veterinarian.

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. An answer to the mystery of wanton queen honeybees: promiscuity produces more productive colonies (Mattila and Seeley, Science, 2007), Cornell Chronicle, Cornell University
  9. Heritability in honey bees of characteristics associated with resistance to Varroa jacobsoni (Journal of Economic Entomology, 92(2), 261-265, 1999), J. R. Harbo and J. W. Harris, Oxford University Press
  10. European honey bee, Apis mellifera Linnaeus and subspecies (EENY-568/IN1005), University of Florida, IFAS Extension
  11. Honey bees and other bees: import requirements, USDA Animal and Plant Health Inspection Service (APHIS)
  12. Importing frozen honey bee sperm key to conservation (July 2016), Washington State University News
  13. I.I. breeder queens (Caucasian, instrumentally inseminated), undated listing, 2018 page address, Washington State University Department of Entomology
  14. Short courses: Advanced Techniques in Instrumental Insemination (2026), Purdue University Department of Entomology
  15. Training the future of beekeeping: UF/IFAS Honey Bee Laboratory hosts honey bee queen instrumental insemination workshop alongside Purdue and Apis Engineering (April 2026), University of Florida IFAS, Entomology and Nematology Department
  16. Bridging breeds: enhancing Carniolan bees with Varroa Sensitive Hygiene traits via instrumental insemination (FNC25-1470), USDA SARE, North Central Region
  17. Using medically important antimicrobials in bees: questions and answers, US Food and Drug Administration, Center for Veterinary Medicine
  18. What's buzzing with Africanized honey bees? (Agricultural Research, March 2004), J. Kim Kaplan, USDA Agricultural Research Service
  19. Beekeeper / Honey Bee Queen Compliance Agreement (FDACS-08419, Rev. 01/18), as incorporated in rule 5B-54.0105, Florida Department of Agriculture and Consumer Services, Division of Plant Industry (via Florida Administrative Code)
  20. Fla. Admin. Code R. 5B-54.0105, Location of managed honey bee colonies (effective 27 March 2018), Florida Department of State, Florida Administrative Code