Analogy
This is an analogy between certain faculties concerning a human being and a cow . In India we worship Cow. Milk, curd, Ghee, Cow urine, Cow dung are all ingredients that go into the making of Panchagavyam Ghee an ayurvedic product, which has stimulating and cleansing effect on brain.
The purpose of the analogy is to understand ourselves better, our mind better. Once we know clearly the mechanism that we are, we can operate it to good effect and efficiency.