Kine are always the root of prosperity. There is no fault in kine. Kine always give the best food, in the form of Havi, to the deities.
गावो लक्ष्म्याः सदा मूलं गोषु पाप्मा न विद्यते। अन्नमेव सदा गावो देवानां परमं हविः॥