LIVESTOCK BREEDING NIGHTMARES & COOL FACTS ABOUT WHAT HUMANS HAVE CREATED
GOATS
Have we yet shared the deformed goats of the Arabic world? They are notorious for islamic content. Here's the most famous called the Damascus goat popular in that can go for millions in USD?

If that's not bad enough they crop their ears like this.

the ears without cutting
We also have the Hijazi Goat which like the Damascus is damn near as tall as a person standing.

heres a kid goat
These arent as islamic and are used for milk and meat. Some of their other spin off breeds are in better conformation (how the body is shaped). Still insanity
I also must mention mini fainting goats.
COWS
This is more for educational purposes.
Modern dairy cows are full size Jersey or classic black and white usually when cows FIRST came to America they were this size (later they got bred to the standard size through selective genetics). These are called
mini jerseys and they're popular on homesteads/small holdings and are very healthy little cows.

cute as fuck right?

for reference on what my sperg is going to be about here's a mini Jersey and her baby so you can see the size of her udder, even with her baby feeding you can milk her daily and expect a decent amount for daily use. The udders on beef cattle are even smaller.

Here's a standard size Jersey cow that is used for mass production dairy. I don't know much about Jersey output but Holsteins (black and white) can put out 6 gallons a day and NEED to be milked twice a day where you can do once with a standard mini jersey.
(Not milking cows/other dairy animals or animals with babies who aren't suckling means mastitis which is very bad and horribly painful.)

Here's a Holsteins (post milking vs pre milking). If you've ever watched a dairy cow walk they have to waddle around a lot more due to the size of their udder where that's not true with beef cattle/miniature cattle who have relatively small udders.

here's a full size dairy holstein next to a person in a show ring.
People have selectively bred for bigger udders for production. I wouldn't inherently call it a deformity because the cows can still do all their cow behaviors and obviously still make money so it's not as big of a deal as the goats above. Dairy industry basically is forced to keep their cows VERY spoiled and comfortable because unspoiled unhappy cows do not make milk aka no money. So we reap what we sow in terms of making megamilk giant cows.
SHEEP
This one is semi-personal in terms of my opinion. But I included facts of what have to take into account as a shepherd because of what humans did to sheep through selective breeding.
Sheep come in two types, hair sheep and wool sheep. Hair sheep shed their coats annually. and are the most related to the "wild type sheep" (see below).

a mouflon sheep which is a hair sheep. This is a ram, sheep naturally have gigantic testicles.
Wool sheep are the fluffy ones and do not shed and MUST be shorn or else the wool never stops growing. While most sheep in the industry today are meat sheep or show sheep (there's not much money in wool unless you're a hobbyist) most breeds still are wool sheep and need to be shorn. We have bred out a few breeds who are extra wooly and thus run into A LOT of issues.

These are babydoll sheep, sheep with wool on their faces (babydoll sheep have wool on their eyelids) are more prone to going "wool blind" (wool covering eyes) and are more prone to ear infections because of the blockages in the ear. People bred babydoll sheep because they find them cute.
I think they look retarded and prefer sheep without wool on their head for the reason of them not going wool blind/having messy faces/ear issues
Sheep who are "wool sheep" also have a few extra skin issues that you have to be careful of, this goes with your annual shearing schedule.
- sheep pimples (cysts that can hide under the wool so the farmer doesn't even know, this actually also happens in finer furred dogs like poodles)
- flystrike (this is why the tails of lambs are docked, sheep naturally have long tails that they wag when happy/nursing) Flystrike is when flies lay eggs usually near the rear end of a sheep because it's rear has fecal matter on it. They will eat your sheep alive and this can happen even to good farmers because animals are not clean.
- you need to shave the udders of some sheep before lambing (or else the lambs cannot feed properly).
- you can't always tell if a sheep is a bit too thin or fat with wool on
- We also bred sheep to be kind of retarded, the more "wild" breeds like shetlands (who are wool sheep) are notoriously tricky to move and more intelligent aka untrusting of humans (they're not wrong you know). So some breeds of sheep basically have a negative IQ and anyone whose worked with sheep can attest to this that they do retarded things and can die from their retardation like getting caught in a bush and not realizing they can back out of it. However, we bred for stupid sheep because herding sneaky smart breeds like Shetlands is a nightmare. Thus we must now cope with the consequences of retard sheep.

Also please peel your sheep annually if not more often. This is what happens when you don't
The most famous sheep with overgrown wool was a ram who escaped and thus wasn't shorn for a few years. He was named Shrek and became a celebrity. Shrek is a merino sheep (known for immense wool production and thus the most popular breed for it). This is his picture. He was undoubtedly wool blind because they grow top poofs as I've said before.

this is his fleece after FINALLY being shorn. That's really heavy
I also want to share this breed that's popular for meat but that I think is the god awful ugliest thing ever.

Texel sheep
Texel sheep look like pitbulls/bulldogs to me and are good meat sheep, but their issue is the same as with other bulldogs is that they're SO wide that they can get stuck in the birthing canal more often/the moms need help lambing. Lambing time is already a nightmare for shepherds and having to help a flock of moms by helping them with huge lambs isn't fun for mom or shepherd.
Notice they also have a flat back, remember what I said about sheep being bred to be dumb? Well there is a thing with sheep where they roll over on their backs and get stuck and can die from suffocation or predators like crows (which will pick eyes out of sheep), usually this happens in little hills on land. This is called being "cast" and admittedly looks funny as shit despite the dangers. See following image:
Being cast is a result of the following which are all breeding related:
- they're pregnant and thus VERY wide
- They are unshorn and thus VERY wide
- you always breed sheeps for flat backs to have even weight distribution, the only downside is if they're flat on their back....they get stuck. note with the mouflon the conformation of the ram that even if he didn't have horns, he likely could not be cast the same way because he's not THICC
Once again, this is the fault of humans.
This is not the entire list of every livestock breed, animals like commercial turkeys (who are white feathered unlike the wild type) gain weight like crazy and only have a natural lifespan of 3 years because they're bred to gain weight. So the yearly pardoning of the turkey from the president is kind of stupid because those birds are meant for food not for living long natural lives and if anything, prolonging their lives with their massive weight gain is bad for them because they cannot support their own weight on their little legs. Slaughtering them is more humane than keeping them as pets. I'm positive I'm missing more that's a few animals that are the result of domestication/ selective breeding.