Is this a Fact ? Obviously, it's not. But it can seen as one of the eternal desire of mankind to reach the Supreme Soul.
There are many rituals in Hinduism which involve a Cow. The one where a person wants to cross the mythical river Vaitarani with the help of a cow, involves the person walking in the ritual, with the tail of the cow in his hand.
I've a cow in my home as well. We lovingly call it Radha. Radha means Prosperous. And it is also believed that a House with a Cow is Prosperous . In contentment, resources, materialism and spirituality.