Those are the real
hauj sam then. They have been
sam, unlike the fake ones in temples.

Hmong men with long fingers in China, Laos, and Thailand castrate roosters by incising the chickens right below the anus, reaching deep inside to pull out the testicles.
The opening is sealed back with needles and threads. No analgesia applied.
The roosters don't die and remain total, trusted virgins among the world's most gorgeous hens through one or two mating seasons and grow very fat by new year's feasting times.
That's the purpose.
A slit on their throats puts them right onto the kitchen pot after feathers and organs are removed. Their broths are absolutely yummy when boiled with just salt and lemongrass! Most loved when extremely hot with oil on top of the broth and no signs of smoke or stinging heat.
A sip of the broth gives one the feel of Heavenly blessing.