The cow is a sacred symbol in Hinduism as it is worshiped all over the country. They are considered as manifestations of Mother Kamadhenu. Kamadhenu refers to the cow of plenty or the one who fulfills all desires. She is also known as the mother of all cows.
The cow has been worshiped since ancient times of Lord Krishna as he was reared and looked after by a herdsman’s family. It is believed that Krishna created a cow called Surabhi and a calf called Manoratha from the left side of his body as he and his consort Radha thirsted for milk. It is also mentioned that the Kamdhenu cow emerged from an ocean of milk and has her abode in Heaven. The cow is considered the most splendid embodiments of divinity. She is even considered a goddess in Hindu Mythology.
Idols of mother cow (kamadhenu) with its calf are believed to be very auspicious as they symbolize prosperity and good wealth. She is also a symbol of Vatsalyam or motherly love for her child. Thus, it is very good to keep this idol at home. Many people worship this idol on Diwali or Bali Pratipada day.