biology

Semen collection

Semen collection is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Semen collection rather than just read about it. In short: Semen collection refers to the process of obtaining semen from human males or other animals with the use of various methods, for the purposes of artificial insemination, or medical study (usually in fertility clinics). Semen can be collected via masturbation (e. g., from stallions and canids), prostate massage, artificial vagina, penile vibratory stimulation (vibroejaculation) and electroejaculation.

Key takeaways

Semen collection belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Semen collection to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Semen collection from memory before moving on to harder problems.

Reference excerpt

Semen collection refers to the process of obtaining semen from human males or other animals with the use of various methods, for the purposes of artificial insemination, or medical study (usually in fertility clinics). Semen can be collected via masturbation (e. g., from stallions and canids), prostate massage, artificial vagina, penile vibratory stimulation (vibroejaculation) and electroejaculation. Semen can be collected from endangered species for cryopreservation of genetic resources.

By species

Humans

Methods of semen collection from humans include:

Masturbation, directing the sample into a clean cup. This is the most common way to collect a semen sample. Sexual intercourse using a special type of condom known as a collection condom. Collection condoms are made from silicone or polyurethane, as latex is somewhat harmful to sperm. Many men prefer collection condoms to masturbation, and some religions prohibit masturbation entirely. Adherents of religions that prohibit contraception may use collection condoms with holes pricked in them. However, such samples are inferior to the ones collected by masturbation in clean cup. Coitus interruptus (withdrawal). With this technique, the man removes his penis from the vagina near the end of intercourse and ejaculates into a wide-necked cup or bottle. If an analysis of semen quality is required, this technique is generally not recommended as part of the ejaculation could be lost which decreases the accuracy of the results. Surgical extraction, if for example a blockage in the vas deferens is suspected to impede fertility, semen can be taken directly from the epididymis. Such a collection is called percutaneous epididymal sperm aspiration (PESA). Alternatively, the testicular tissue itself, instead of the sperm produced can be investigated. Then, the collecting method is called testicular sperm extraction (TESE). A Cochrane review found insufficient evidence to recommend any specific surgical sperm retrieval technique for men with azoospermia undergoing intracytoplasmic sperm injection (ICSI). Penile vibratory stimulation (PVS) and electroejaculation are two other alternatives for men with anejaculation due to spinal cord injury. The penile vibratory stimulator is a plier-like device that is placed around the glans penis to stimulate it by vibration, and provides the first-line method for sperm retrieval in spinal cord injury patients with anejaculation. The best specimen is produced when a short period of 3–5 days of abstinence is observed. A more prolonged period does not yield better results.

Cattle

The process of bovine semen collection is vital in the agricultural industry as it allows farmers to improve the genetics of their herds and increase the efficiency of their breeding programs.

Horses For semen collection from stallions, the most common method used is an artificial vagina; after collecting semen, it is tested, diluted, then stored according to the intended use. Semen can be either liquid or frozen. There are many kinds of preservatives used in dilution with semen - most contain energy and antibiotics for liquid, and protection from freezing for frozen semen. Many studies are ongoing to improve preservation, increase liquid semen storage time, and reduce or remove bacteria from semen.

Canids

Dogs

In order to collect semen from a male dog, an artificial vagina is prepared, which is a conical thin latex sleeve ending in a sterile collection tube. The inside of the latex sleeve is lightly lubricated. The male is allowed to sniff a female in estrus. Experienced studs cooperate readily in the process. New studs often require encouragement in the form of manual stimulation, also known as "manual ejaculation". Generally the male will mount the female, and the collector quickly directs the dog's penis into the latex sleeve. The male ejaculates and the semen is collected in the tube. The semen is then drawn up into a long thin pipette. Prior to ejaculation, the penis is massaged inside its sheath. It is then extruded from its sheath, and the collector massages the dog's erect penis near the base of the bulbus glandis using the thumb and index finger. The dog begins pelvic thrusting movements at the onset of ejaculation.

Wolves Semen can be collected from wolves via manual stimulation or electroejaculation.

See also Canine reproduction#Procedure Conception device#Semen collectors Collection condom Cryoconservation of animal genetic resources#Semen Posthumous sperm retrieval Semen analysis Sperm theft

References

Bibliography I. Gordon (2004). Reproductive technologies in farm animals [electronic resource]. CABI. pp. 62–. ISBN 978-0-85199-049-1. Retrieved 18 May 2013. Wilson G. Pond; Alan W. Bell (2005). Encyclopedia of Animal Science. Marcel Dekker. pp. 130–. ISBN 978-0-8247-5496-9. Retrieved 18 May 2013. Deborah Reeder; Sheri Miller; DeeAnn Wilfong; Midge Leitch; Dana Zimmel (30 July 2012). AAEVT's Equine Manual for Veterinary Technicians. John Wiley & Sons. ISBN 978-1-118-50482-6. Retrieved 18 May 2013. Graham Munroe BVSc (Hons) PhD Cert EO DESM Dip ECVS FRCVS; Scott Weese DVM DVSc DipACVIM (15 March 2011). Equine Clinical Medicine, Surgery and Reproduction. Manson Publishing. pp. 334–. ISBN 978-1-84076-608-0. Retrieved 18 May 2013. Juan C. Samper (2009). Equine Breeding Management and Artificial Insemination. Elsevier Health Sciences. pp. 38–. ISBN 978-1-4160-5234-0. Retrieved 18 May 2013. Steven P. Brinsko; Terry L. Blanchard; Dickson D. Varner; James Schumacher; Charles C. Love (19 May 2010). Manual of Equine Reproduction. Elsevier Health Sciences. pp. 547–. ISBN 978-0-323-06513-9. Retrieved 18 May 2013. Schmitt, D. L., and T. B. Hildebrandt. "Manual collection and characterization of semen from Asian elephants (Elephas maximus)." Animal reproduction science 53.1 (1998): 309–314. Brown, Janine L., et al. "Successful artificial insemination of an Asian elephant at the National Zoological Park." Zoo Biology 23.1 (2004): 45–63. Howard, JoGayle, et al. "Electroejaculation, semen characteristics and serum testosterone concentrations of free-ranging African elephants (Loxodonta africana)." Journal of reproduction and fertility 72.1 (1984): 187-195.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Semen collection

Start with the simplest possible case. Write down what Semen collection claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Semen collection before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Semen collection ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Semen collection

In research: Semen collection appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Semen collection in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Semen collection is common in secondary-school and first-year university syllabi. It links to neighbouring topics Artificial insemination, Fertility medicine, Livestock, so understanding it makes those chapters shorter.
In everyday life: Look for Semen collection outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Semen collection in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Semen collection means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Semen collection out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Semen collection in simple terms?

Why does Semen collection matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Semen collection?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Semen collection.