A father has been jailed for 15 years for the "abhorrent" and prolonged sexual abuse of his daughter, which resulted in her becoming pregnant when she was 14.

About a week after the Court of Appeal called on Victorian judges to impose tougher sentences for incest, a County Court judge set a non-parole period of 12 years, for the man who abused his daughter from when she was seven.

The judge said the man's actions were 'an appalling breach of trust'. Credit:John Donegan

The daughter later gave birth to a boy who was her father's biological son.

That boy is now a teenager, with intellectual and physical disabilities.