Many breeders say they do not cull, and the meaning of this is always that they do not kill rats that are healthy and can live good lives. So they would never reduce a large litter down, they would never kill a rat that they had finished breeding with that was still healthy and happy, they would seek veterinary treatment for ailments rather than just kill rats that were ill.
When people jump on them saying ‘aaah but that means you allow rats to SUFFER because you won’t cull SICK RATS’ it just becomes nonsensical because they’re not using the language in the same way as the breeder they’re ranting about. No breeder I have interacted with would consider the killing of a rat who is sick or suffering to be culling – it is for the benefit of the rat, not the benefit of the breeder or the ‘greater good’.
I wouldn’t tend to use the term soft cull as I don’t think it’s a particularly useful term – the majority of rats are soft culled as the majority of rats are not bred from. If I am pet homing I tend to just say they have been petted out. Sometimes I keep a rat and just don’t breed from it for whatever reason, but as it’s never been part of my breeding program there is never a point where I need to announce it as not in my breeding program anymore.
So my terminology would be:
Euthanised or PTS – killing a rat for the express benefit of preventing or stopping suffering of that rat.
(hard) culling – killing a rat because the breeder does not wish to own it, for example it’s the 9th in a litter and you only wish to keep 8, or it has white toes, or it doesn’t have your preferred temperament, or it has been used for breeding and now you have no further use for it.
Pet homed / soft culled – a rat that is not being used for breeding. A cage warmer 🙂