Will it be sad to give a kitten to a female cat? It depends on the female cat's personality. If the female cat is a separate cat, it may not be sad. If the female cat is a female cat who cares very much about the kitten, it may feel sad.
If the kitten is sent away just after birth, the female cat will not react too strongly. If the female cat has been feeding the kitten for a long time and has been with it for a long time, when the kitten is sent away, the female cat will feel sad and experience reduced appetite and poor spirits. However, after a while, the female cat will slowly forget the kitten and gradually walk out of the sadness.
Cats have different concepts of blood ties than humans. Don’t worry that the female cat will be very sad. It will be better after a while, just rest assured. Be careful to find a good family to take care of the kitten.