Fifty cows and 20 calves were killed in a barn fire north of Walkerton, police say.

South Bruce OPP say their officers and firefighters from Elmwood were called to the barn, on Concession 12 in Brockton, around 9:20 p.m. Wednesday.

Damage from the fire is estimated at $500,000.

In addition to the livestock, that total includes the barn structure itself, as well as farm equipment kept inside.

While the cause of the fire has yet to be determined, police say it does not appear to be suspicious.