A character, or mass of characters, that are used for breeding without having a choice in the matter.
Reasons behind this include: belief that it will promote scientific interest, belief that it will make future generations stronger, belief that it will assimilate a group, belief that it will assert dominance of (and "breed out") a race, or practical means for turning a Slave Race into a Servant Race. Or baser reasons like Lust or Ego.
Regardless, don't expect them to care about the victim's feelings on the matter. When it involves sex, by definition, this is a Rape Trope, since the person's consent is a non-issue. Even when the slave is willing, the fact that they are a slave without any real ability to choose makes this Questionable Consent at best.
Sub-Trope to Chosen Conception Partner and Made a Slave, without the person having a choice in the matter. Is most often a specific form of a Sex Slave, though Speculative Fiction tropes can skip the sex entirely. Often used for titillation and Fanservice, especially in Fan Fiction and Pornography, but it's also used to help to show just how insane, corrupt, or downright evil the enemy is.
This almost always involves a female being forced to bear offspring for an enemy group, though it does occur with males as well. When a male is the victim of a female, it's generally played as comedic, desirable, and/or a mark of the male's sexual prowess. In the rare case when a male victim is taken seriously, he's almost always killed after the woman confirms her pregnancy (or immediately after sex.)
- Berserk: The Midland women captured by Emperor Ganishka's forces are put in a magic device that infuses their unborn child with demonic energies, turning it into a demon called a Daka. The Daka then bursts its way out of the womb, killing the host, as a way to strengthen the demonic army.
- In Daily Life with Monster Girl, Miia was supposed to bring back a human male to breed with her entire village because lamias are all born female and this is their only way to perpetuate the species. On screen, this only happens in a Dream Sequence where Miia imagines her "darling" Kimihito in this situation, eventually too exhausted to do it when her turn comes.
- In the last part of the Karin manga, it's revealed that this is what happened basically to every incarnation of Sophia "Spirit of Psyche" Pistis, a female vampire with the ability of bestowing fertility on other vampires, which is very important since they're a Dying Race. For thousands of years she was reborn within the body of a vampire of the Armash bloodline (Karin's maternal family) and forced to have a child to continue that bloodline. And this would have ultimately happened to Karin herself (aka the latest Psyche) had her Badass Family not gone into a Roaring Rampage of Rescue and given her Laser-Guided Amnesia so that she could have a normal life and break this "cycle"... Ultimately, Sophia was reincarnated again as Karin and Kenta's daughter Kanon and was able to "rest".
- Uchi no Musume ni Te o Dasu na!: During chapter 16, Hana reveals it was the Japanese government who created Deepthroat. They captured Zenovia and performed experiments on her to learn the secret of her strength, but their instruments couldn't pierce her body. So they resorted to having her raped by supervillains. Each time she was successfully impregnated, they extracted her ovum and repeated the process until they had an army of offspring with superpowers. Which is what caused Zenovia to turn to villainy and seek revenge against all of humanity.
- In World's End Harem, exactly five men in the whole world survive the purge which a virus carried on against all other men on Earth, the surviving women rose to power and now demand that these five men produce children that can bring about a new human race.
- Though not technically a slave, Rei Todoroki from My Hero Academia qualifies. She was effectively purchased by her husband, who used her to breed children until he had what he wanted. Her husband also assaulted her when she attempted to protect their son from being tortured.
- In The Authority, Regis Slzfi headed an empire on an alternate Earth that turned all of China into a rape camp in an attempt for his dying race to produce offspring.
- Batman: In one story-line in Tales of the Dark Knight, Batman, who had just started working as a vigilante, actually enjoys what he does until he meets the Monster of the Week—the son of a Nazi female scientist who looks down on him but grows somewhat fond of Batman, trying to get him to have a child with her. Partially through her son's help, Batman manages to escape and swears to never think of what he does as 'fun' ever again.
- In Wish Carefully Eight magically powerful girls from ages 13 to 25, collectively known as the Cabal, were kidnapped to be bred among the higher ranks of the Death Eaters. The girls are continuously impregnated until the end of their fertile years with their children either being taken from them or to share their fate.
- In Pokémon Reset Bloodlines, the Bloodline King orders his Emissary to kidnap Misty's older sisters to be used to breed more Bloodliner children.
- Dungeon Keeper Ami: Malleus's slaves, who also doubled as Sex Slaves, as said:
To Malleus, the poor girls chained naked to the walls were nothing but objects of convenience, there to sate his lusts and produce offspring.
- The villainous, eponymous monsters in the Alien franchise do this to any species they encounter, specifically humans. By design, the Xenomorphs were created to invoke every possible means and horrific result of rape, including impregnation. As such, those humans they don't kill they typically bring back to and cocoon within their nest, where they will be impregnated by a facehugger. The "birthing" process, however, is fatal.
- Conan the Barbarian (1982): During his stint as a gladiatorial slave Conan was, shall we say, put to stud.
- In Mad Max: Fury Road, Immortan Joe's five "Wives" are this, with each being given three chances to bear him a healthy male child before being cast out. If the implications about the "milk mothers" who are treated like livestock and constantly milked to provide sustenance to the Warboys is true, he's gone through quite a few of them. The plot of the movie concerns Furiosa betraying Joe to liberate his five current "Wives", leading to Joe launching a relentless chase after her to get them back.
- In Don't Breathe, the Blind Man has been keeping Cindy - the woman who killed his daughter - prisoner in his basement until she agreed to have his child (via artificial insemination). After she is killed, he attempts to use Rocky for the same purpose.
- In Aria the Scarlet Ammo, Vlad abducted Riko Mine Lupin after her parent's death and kept her in a cage in the hopes of assimilating her genes, as he did with many people before (since she descends from a very powerful family). But since after some experiments he considers her a genetic failure, he intends to use her to produce a child that he could actually use. Whether he means fathering the child himself isn't made explicit though — the series isn't that dark.
- Goblins in Goblin Slayer often subject the women they capture to this treatment, as goblins in this series are a One-Gender Race that can't reproduce except with other species, and because they are utter rape-happy bastards. The women involved are killed when the goblins have no more use for them, and those that survive are often traumatized for life.
- The main villains of the Bazil Broketail novels use this as their main means of producing soldiers. Human women are used to breed imps as their primary infantry unit and animals are used in a similar fashion to breed their heavy units like trolls and ogres.
- The Belgariad: The Dryads, who have only females, capture human males to reproduce with.
- In the Black Jewels books, this overlaps with Sex Slave for Damon and Lucivar, although due to various reasons the baddies never actually succeed in getting them to impregnate anyone.
- Mentioned in John Norman's Gor series. Sex Slaves are common, and it's mentioned that there are bred slaves. The dominance/submission issues involved are often explored.
- Handmaids in The Handmaid's Tale by Margaret Atwood. Women of reproductive age who had "lived in sin" by the standards of the Republic of Gilead are sent to the Rachel and Leah Re-education Center. After being re-educated, the Handmaid then stays with an upper-class family and is regularly raped by the Commander in the hopes that she will get pregnant with a live, unmutated baby on behalf of his barren Wife. If she fails, she gets two more chances with this with two other families. If she fails those, then she's sent to the Colonies.
- Tindwyl in the Brandon Sanderson Mistborn novels was used as a breeding slave in the Lord Ruler's breeding program for the Terris people.
- In some works in the Star Wars Expanded Universe (they're mentioned in X-Wing: Wedge's Gamble and The Bounty Hunter Wars), Kuati nobles are said to keep telbun, slaves apparently used for both recreational and procreative sex. In Wedge's Gamble Erisi Dlarit and Corran Horn use a Kuati noblewoman and her telbun as their cover ID during The Infiltration, and Erisi tells an Imperial customs agent that she's come to Coruscant with her telbun to conceive, following family tradition.
- In Time Enough for Love Lazarus Long recounts a time he bought a brother-sister "breeding pair" of genetically modified slaves with the intent to free them on a planet where two hundred years before he himself had been made a slave. In fact the two he bought turned out to be his great-great-great-grandchildren.
- In the second The Wolf Chronicles novel, it is revealed that when Borlla had vanished in the first book, she had not died as her packmates thought, but instead was being kept as a slave by the Greatwolves to breed with so that the Greatwolves don't become too inbred. A few other young wolves, including males, are also being kept by them for the same purpose.
- The whole reason the cribs exist in A Brother's Price is so that women who can't afford husbands can get pregnant by the men held captive in said cribs.
- Male Ayyad from the The Wheel of Time. They are not taught anything and only basically know how to feed and dress themselves. They have no names and are referred to as "the male". At age 16 they are hooded, cloaked and presented to any female Ayyad that want children. At age 21 "the male" is studded again then executed and cremated.
- Earth: Final Conflict: Lily Marquette gets captured by aliens and used for breeding.
- Wade is written out by being captured by CroMags and sent to a breeding center.
- The episode "Love Gods", where all males are rounded up and used for breeding (with human females who are lucky enough), including Quinn.
- In Stargate SG-1 the Jaffa do double-duty as Slave Mooks and as living incubators for Goa'uld larvae. It's not purely a one-sided deal though, as the larvae push the host Jaffa's system far beyond the abilities of any normal human being, such as increased durability and strength.
- In Helix it is shown the immortal Michael maintained a forced breeding dungeon to accomplish his wish to have an immortal child (2x10 - Mother).
- The Handmaid's Tale: This is the Handmaids' role, to provide children for the Commanders.
- In an episode of Buck Rogers men are lured to the planet Zanthia, which has become an artificial Lady Land following the capture of the entire male population as prisoners of war, to serve as slave studs. Luckily for Buck, the woman for whom he's purchased (and dressed in as fetishy an outfit as you'll see on a man on American TV in the 1970s) is more interested in rebelling against her mother, the Prime Minister who instigated the slave policy.
- One of Heracles' lesser-known feats occurred during his stay with the Amazons alongside Theseus. The queen, wanting to enjoy Theseus' company as long as possible, told them they were prisoners until Hercules had impregnated 50 Amazon women. Being, well, Hercules, he did so in one night.
- In Dragon Age, the Darkspawn often capture people alive and drag them back underground where they are force fed the flesh and or blood of darkspawn. Men become ghouls while the women are turned into Brood Mothers — Huge, obese monstrosities riddled with Body Horror that do nothing but birth new Darkspawn.
- In Duke Nukem Forever, there is a scene where women are captured, stripped, cocooned, and impregnated by alien creatures. Apparently, their bodies also explode when the alien spawn emerges. Two recurring minor characters, the "Holsom Twins", suffer this fate while Duke quips sarcastically. This is widely considered to be the low point of the series.
- The Elder Scrolls
- According to background information, the Breton race resulted from the selective breeding of high-ranking Aldmer men with Nede (human precursors) women they took as second wives. The Bretons would eventually out-populate either parent species in the region. Typically the children of a human/elf interbreeding would be the same race as their mother and only have a small number of minor traits from their father, but the Aldmer spent so long using Nedic women as their concubines and fathered so many children that elven characteristics became much more commonplace within the human population in High Rock and the Bretons became their own distinct race.
- St. Alessia, the "Slave Queen", was Born into Slavery in the Ayleid city of Sard, now known as Sardavar Leed. Sard was well known as a slave breeding center, and this likely would have been her fate had she not escaped. She would later lead the Alessian Revolt to overthrow the Ayleids and would be named as the first Empress of Cyrodiil.
- Saints Row: The Third: Oleg was captured and used as a base for an army of physically powerful, but mentally flawed, clones, in a non-sexual example.
- In Warcraft II, the building used to create dragon units consists of a chained-down dragon queen Alexstraza, forced to lay eggs to produce young that will fight for the Horde. You can even build several of her. (Probably averted via Retcon later; according to a book in World of Warcraft, she was forced to make her adult children fight for the old Horde.)
- It's a meta example, but anyone who has played their fair share of Pokémon videogames may tell you how the Pokemon named Ditto is used. It can breed with any Pokemon except for anyone in the Undiscovered egg group, which mainly consists of Legendary pokemon and Baby Pokemon. Some lampshade the tendency of players to use it for breeding by bypassing the censors and giving it offensive names on the Global Trading System. There's even memes about it..
- In an intro dialogue between the two in Mortal Kombat 11, the Kollector tells Cassie Cage that he has this in mind for some of his associates when she asks why he's interested in Earthrealm.
- In Drowtales the warlord Quain'tana uses her daughter Mel'arnach as this after a timeskip, in return for not outright killing Mel earlier. This is because Quain'tana herself is unable to have any more children but needs to secure an blood related heir to the clan and in fact took the protagonist, Ariel, from her real mother Mel as an infant for this purpose and Mel has had three children, two boys and a girl, in the 15 years after this deal was made. She was also used much more indirectly for this by her lover, Snadhya'rune, who took her genetic material under false pretenses and made a child who was carried to term in a Uterine Replicator. Mel has apparently failed to notice or deluded herself into ignoring the similarities between the two situations.
- In El Goonish Shive, according to Hedge, this was Damien's plan for Grace if he couldn't find enough chimeras to build himself an army.
- When Evon was captured by the Cabal Maximus attempted to use her to breed an army of super-sorcerers. He was only stopped by a higher-ranking Cabal member who wanted her for a different reason.
- Homestuck's Jake English is captured by a cyborg with the explicit purpose of being turned into one of these. Jake is completely broken by this and tries to isolate himself from others out of shame and self-loathing.