The central fact of Hinduism is cow protection. Cow protection to me is one of the most wonderful phenomenon in human evolution. It takes the human being beyond his species. The cow to me means the entire subhuman world
Cows are amongst the gentlest of breathing creatures; none show more passionate tenderness to their young when deprived of them; and, in short, I am not ashamed to profess a deep love for these quiet creatures.
Thomas de Quincey
All the Upanishads are like the cows, the one who milks the cows is Krishna, the son of Nanda. Arjuna (Partha) is the calf. The milk is the great nectar of the Gita, and the fortunate people of purified intellect are the drinkers and enjoyers of that milk.
Gita Mahatmya (6)
Kamadhenu is the divine wish-fulfilling cow, a metaphor for the soul in the body or the power of God that has entered into all the creation. Anything that you ask from her will be given to you immediately.