Prior to the Neolithic Revolution, small packs of vampires would stalk the larger tribes of nomadic humans, preying on them at night. When humans began settling into permanent villages and cities, most vampires continued their stalking habits, just with more permanent lairs hidden in the outskirts of smaller settlements or the depths of larger ones. However, one vampire was more enterprising than that.
They took a look at the burgeoning husbandry methods to produce domestic plants and livestock and had an idea. They realized that the vampire’s food source (humans) followed all of the same reproduction rules as the creatures the humans were eating. So, they theorized that breeding techniques could produce domestic humans ideal for effortless vampire consumption. They gathered a group of humans to begin their breeding program. Mostly captured as children so they were easier to train.
The experiment was a success and after only a few generations the humans were noticeably more docile than regular humans and willingly consented to being fed upon. The vampire expanded the program from there. With time, they grew their herd and began selecting the best from the herd to be turned into vampire children to help manage the humans and expand the herd further. With time, they because breeding different groups of humans for more specialized purposes. While doing this, they would occasionally mix in humans from “wild” populations to help steer the breeding. As the population grew larger and more stable, this practice diminished. In modern times, there are four distinct breeds of domestic humans.
The first fills the role of house servants to the vampires. They take the role of things like butlers, maids, secretaries, and other domestic service tasks. They are also the ones primarily fed upon because they live in the closest proximity to the vampires. They are specifically bred for both aesthetic appearance and taste as well as being able to handle regular blood loss well. A few specific variants have been bred to be purely decorative (similar to how IRL some dog breeds are purely decorative). If one of them proves themselves especially skilled at household management, they may be selected to become a vampire.
The second breed is selected for intelligence above all else. They take over R&D tasks for society creating new technologies and techniques. They are also the ones that track the genetics and breeding charts of everyone to enable the breeding to be more precise. They have the frailest bodies and are rarely fed upon directly. If one is capable of regularly producing groundbreaking research, they may be selected to become a vampire.
The third breed is the laborers. They are the ones who do things like working the farms to keep the humans fed, working mines and foundries for raw material, construction projects, and other physical tasks. They are bred for strength and endurance, often sacrificing aesthetics to do so. They tend to be short and stout with a fair bit of chubbiness, but will often have a surprising amount of strength and not tire from working all day. They will also run nursery schools for humans of all breeds. The women are bred to naturally lactate in adulthood even without having children themselves and so will act as wetnurses for all breeds. In recent years, as in-vitro technology improves they have also begun serving as surrogate mothers for other breeds. If one proves particularly skilled as a foreman or something similar, they may be selected to become a vampire.
The fourth breed is the warriors. In ancient times, they are the ones who would raid other nations to capture new breeding slaves or other resources. They would also be the primary defense against invading armies. Foreign armies would often be set upon by vampires at night, but in the day they were vulnerable and it was this breed that took charge of defending them. In more modern times, they more act as a deterrent force and occasionally deploy in “peacekeeping” missions to protect the international interests of the nation. They are bred to be as large and powerful as possible. Capable of great feats of strength and speed to overwhelm opponents. But, as a trade-off, they are the most prone to injuries as they age due to their bodies not being able to keep up with how strong they are (similar to racehorses IRL). If one of them is a particularly skilled commander, they may be selected to become a vampire. However, more often vampirism is given as a reward for some great act of heroics.
Vampires act as the nobility for the society and have a strict hierarchy among themselves. Because they are drawn directly from the various human breeds, they see themselves as having a kinship with them. In turn, the humans see the vampires not as a separate group of people, but the best and brightest of themselves. This means that concepts like Marxism and other peasant revolt movements struggle to find footing here. Though an outside sociologist might note a highly stratified caste system with five levels, the members of the system do not see it that way. They see four tribes of people with a united body of rulers shared between them.