From “the Antichrist trying to deceive you” to “the actual Antichrist”

From anime familiar, to miniboss

Seems to be a super old breed, like I couldn't even find a guess at when they were established.

But they were just the generic goat for a big area where both goats were important, and established trade routes allowed a high degree of genetic variation at first. But then the adults that were allowed to reproduce were always the ones who produced the most milk and meat.

Absolutely zero care about how an adult looked, zero aesthetics. If that weird ass adult look wasn't tied to something that makes more milk and cheese, it wouldn't be that weird.

However the breeders know all things being equal, customers would pay more for a goat that didn't look like ass.

So when choosing which to breed, you pick the most aesthic looking goats hoping for a higher price for the offspring. But with those weird ass adult dreams (almost certainly) increasing milk/meat yield, and everyone wanting to buy the milk goat that looks least hideous...

That split between infant and adult makes sense.