A farmer who is accused of raping his wife and underage stepdaughter over two decades has also been charged with committing sexual acts with cows and calves.

The dairy farmer allegedly told his wife about having sex with his cows and made her watch as he made the calves perform sexual acts on him.

The man, whose name cannot be reported to protect the identity of his accusers, is on trial in New Zealand where he faces 38 charges of sexual assault, including 15 of rape, one of bestiality involving cows and one of performing indecent acts on calves.

His stepdaughter said the offending began when she was under 10 years old and escalated to near-nightly rapes for the next decade, Whangārei District Court heard.

She claims she was raped nearly 300 times, Crown Prosecutor Geraldine Kelly told the jury.

The victim said she felt relief when her stepfather got a vasectomy, The New Zealand Herald reported.

Kelly said: ‘Getting pregnant had been a concern for her before she was 12.’

The girl did not speak about the offending out of love for her stepfather as well as ‘confusion’ over her body’s response to the abuse, Kelly said.

The dairy farmer allegedly had sex with his cows and made calves perform sexual acts on him

The court heard the man had a ‘daily requirement’ for sex which also led to his alleged sexual offending against his wife.

He allegedly believed rape did not exist, saying that all women give in eventually and enjoy sex.

He also told his wide that ‘no means yes’, Kelly told jurors.

The man allegedly admitted to his wife that he had been having sex with some of the cows and showed her how he did it.

During calving season, the man allegedly made the calves perform oral sex on him, which his wife also saw.

Kelly said that on at least 20 occasions he would make his wife have sex with him after the act with the calves.

Kelly added: ‘She told him she found it repulsive but he would just do it’.

The farmer’s lawyer Matthew Ridgley said the alleged bestiality with the cows was nonsense.

Whangārei District Court where the man is on trial in New Zealand where he faces 38 charges of sexual assault

He told the jury it was for them to decide whether what happened was indecent.

He said the farmer acknowledged he had sex with his stepdaughter but argued it was consensual and when she was over the age of 16.

Ridgeley said that any sex with the man and his wife was also consensual 

The trial is expected to last three weeks.