Let's say I have a Supernatural Creature (SC). My SC is effectively immortal and obviously non-human, and thus really values her privacy. She also lives in a sort of "pocket dimension" (think: parallel Earth) wherein she enjoys a level of reality-warping powers (details later). She can access Earth via one or more doorways.
Now... let's say she wants to keep a bunch of animals; sort of a farm/zoo hybrid. In particular, she would like:
- 6-12 horses
- 8-20 cattle (mostly cows, sometimes a few calves)
- 4-20 sheep and/or goats
- 8-30 pigs
- 6-8 adult sows
- 2-4 adult boars
- 0-20 juveniles (this is probably time-varying)
- 4-20 canids (mix of domestic dogs, wild dogs, wolves, foxes, etc.)
- 2-4 large domestic cats (e.g. Savannas)
- 2-6 medium-sized wild cats (e.g. lynx, ocelots, servals)
- 2-8 larger wild cats (e.g. cougars, lions, tigers)
- 2-6 hyenas
- 4-12 wargs (think "wolves, but the size/mass of horses")
These populations are variable (especially some of the cattle and pigs are bred and slaughtered), but estimate about 15 pigs, 0-5 calves, 10 cows1, and 60-70 others at any time (see below for explanation of this break-up). More or fewer critters will imply that their caretakers are more or less harried. The helpers should be willing, so the load from a "typical" population should be something they can handle "comfortably".
Note that this means that the population will rarely or never have animals, aside from piglets, that are less than 30-50kg. That is, the SC is not (routinely) keeping small mammals or non-mammals. (Such animals will of course be "around", but totally loose and left to look after themselves.)
Ignoring stuff like cost, laws, and ability to provide food and shelter, what is the minimum number of people that would be required to care for this menagerie? (The fewer people the SC has to "bring into the masquerade", the better. Also, I don't want to say "ignore ethics", but the SC is going to tend to favor minimizing labor over animal welfare, albeit within limits and not without a certain amount of anachronism and/or schizophrenia. Please try to keep the ethical objections to a minimum: remember, this is fictional and should not be taken as an endorsement of such methods of husbandry.)
The SC has the ability to "reshape her reality as she wishes". This is mostly going to be hand-waved, but it requires conscious direction; she can't, for instance, set up a food bowl that is always full (unless it works via mundane means). She can produce just about any building or machine that exists in the modern world, or do things like walk up to a refrigerator, grain bin, etc. and have it be full when she opens it. She can also provide reasonable amounts of power (say, up to 1MW) and ensure that natural sources of water (i.e. a river) are available and can be used without treatment. (Disease is also a non-issue, and the SC can generally take care of injuries.)
This all means that the infrastructure provisioning and repair can essentially be hand-waved. What is left is preparing and bringing food to the animals, providing exercise2 and enrichment, waste removal3, training4, and whatever breeding-related intervention5 is needed.
As further clarification, I am notionally breaking up the animals into four groups (feel free to explain to me why these groupings are wrong):
- Group 1 (pigs) is more or less "hands off"; feeding is mechanized, cleaning is partly3 mechanized, and need shifting at most once a day. (Some are given access to pens and may need to be brought back in at night. Less frequently they may be moved to different pens.)
- Group 2 (calves, 0-5) needs food and water delivered to individual animals, multiple times a day. They are never moved daily, but may be moved once every few days or weeks.
- Group 3 (cows1) has partly3 mechanized cleaning and can be fed as a single group with mechanized assistance. They need to be milked several times a day and are shifted between stalls and pastures at least twice a day (in and out is two shifts). Assume they'll wander into the milking stalls on their own, but a human needs to connect and disconnect the milking machines.
- Group 4 (everyone else) has mechanized water delivery, but need food and cleaning for each individual or small group and need to be shifted at least twice a day. Many will also need enrichment items provided at least every few days. (Grazers will of course graze, but will still get supplemental food that needs to be delivered.) As many of these are social animals that can be handled on a group basis, their "effective" head-count is likely between one half and one quarter of the actual number of individual animals. (This is somewhat less relevant for shifting, but assume they are generally cooperative.)
1 Use of cows, rather than cattle, is intended. In these instances, the calves and bulls are in different groups.
2 The SC prefers for this to be "hands off" most of the time... e.g. "turning out" animals into larger enclosures is preferred to "walking" animals on a leash or tether or use of exercise machines. Socialization is also a non-issue.
3 Waste in night pens needs to be cleaned. Waste in large enclosures, I'm not sure about. Probably for the grazers, it can just be left; assume also that this pasturage will always have grass. For the others, if the SC can "enhance" the rate at which insects take care of it, is that sufficient, or do people still need to collect it?
4 I'm going to somewhat, but not completely, hand-wave this. Let's just say that, due to the SC's abilities, I need the equivalent of one full-time person doing nothing but training and can otherwise ignore this, unless that would give a larger answer compared to factoring in training with everything else.
5 Assume no intervention is needed to prevent breeding, but that "assisted breeding" will happen on occasion, i.e. 1-3 people will be busy with this for up to a few hours, perhaps once a week on average. (Probably the actual days will tend to clump.)