“Whoever feeds the cow with grass and water every day derives the benefit equivalent to performing Ashvamedha Yajna. There is nothing to doubt about this”.
—- Brhat Paraasara Smrti 5.26-27
Perform go-puja or yajna on your birthday, anniversary, when a child is born, in honor of a departed loved one, etc. The herd’s regular diet is paddy straw, grain mix porridge, wheat bran, chickpea husks and fresh grass is available in farm at no cost, other items like Jaggery and pooja essentials like dhoopsticks, flowers, banana etc. you should bring with you.