May be animal breeding you can choose to encourage farm animals or kept animals to breed.
but also human breeding?
a male and female can choose to try for a child. may be miscarriages and other problems could happen, but it would allow you to produce a heir to pass your skills and worth on to later, though you have to make sure they don't die for that ever reason.
it could be being pregnancy effects your skills and are a lot more weaker then normal while pregnant especial in the later stages. If your child dies from reason and you don't produce another heir before you grow old your blood line is lost?