The steer was one of 11 in a paddock and was the biggest, Mr Vink said.
"This one was destined for the freezer come the summer.
"We had it all lined up for the BBQ."
Mr Vink said it was not the first time the oak tree had been hit by lightning and a dying branch was evidence of a previous strike about two years ago. This week the lightning had blown all the lights in the homestead and had cooked the telephones.
"We had to go and buy some new ones." The steer was going to be buried on the farm.
Lightning also burned part of the weatherboard of Kim Hollis' home at Whau Valley and caused a server failure at BP Riverside.
Ms Hollis said she heard an almighty crack and a strange noise about 11am on Wednesday as she prepared to go downstairs.
When rain stopped, she went outside and saw a charred mark out the back the house.
"I first thought 'gosh how did that happen' then realised what had happened. I was quite amazed," she said.
"Thank goodness it was pouring with rain or I would have had a good fire on my hands. If it can do this in the pouring rain, just imagine what it would do if it wasn't."
BP Riverside cannot accept prepayments until Monday because a lightning strike took out some of its accounting systems.
The pumps are working fine, though.
Northland bore the brunt of nearly 8000 lightning strikes that hit the upper North Island on Wednesday.