Cows in Padmapurana
गावो बंधुर्मनुष्याणां मनुष्याबांधवा गवाम् ।
गौः यस्मिन् गृहेनास्ति तद्बंधुरहितं गृहम् ॥
Cows are the abode of the Goddess of wealth. Sins don’t touch them. There exists a fine relationship between man and cow. A home without a cow is like one without dear ones.