How many calves can a cow have in a year?

It is considered that for a dairy cow to continue producing milk, the minimum number of calves it should have in a year is one. Generally, a dairy cow gives birth to a calf every 12 or 14 months. Considering the present life span of dairy cow or cattle to be 6-8 years, it can be estimated that the cattle would give birth to 4-6 calves during their lifetime.