Here I am willing to veer off into severe off-topic land in my own thread, but be that as it may...

Names for castrated males of all kinds seem to be very important. One of the earliest I learned of, as a child in a boychoir, was "castrato" - a man with the singing voice of a soprano, because he had been castrated just for that purpose. INSANITY In the boychoir, the best singers were threatened with castration, as a complement.

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Found this via Google:

Dutch

[Latin, English, male - castrated version]
Sus scrofa f. domestica / Domestic pig: beer - barg/borg/berg/schram
Bos taurus / Cattle (Cows): stier - os
Ovis aries / Domestic sheep: ram - hamel*
Capra hircus / Domestic goat: bok - weer/hamel*/kapater
Equus caballus / Domestic horse: hengst - ruin
Equus asinus asinus / Donkey: hengst - oen*/kluns*
Felis silvestris f. catus / Domestic cat: kater - gecastreerde kater
Canis lupus f. familiaris / Domestic dog: reu, rekel - ??
Oryctolagus cuniculus f. Domesticus / Domestic rabbit: rammelaar - ??
Camelus sp. / Camel: ??
Elephas maximus / Elephant: ??
Homo sapiens sapiens / wise human: man, castraat (singers)/eunuch (at a court)

Domestic birds:
Gallus gallus f. domestica / Chicken: haan - kapoen*/Engels haantje (lit. English cock, or should I say English rooster?)
Meleagris gallopavo / Domestic turkey: ??
Anser anser / Domestic goose: ganzerik, gent, gander - ??
Note:
The words marked with an * are often used in connection to people. E.g. 'oen' is used for 'idiot', 'kluns' for somebody who's very unhandy, etc.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)