O Kṛṣṇa, O friend of Arjuna, O chief among the descendants of Vṛṣṇi, You are the destroyer of those political parties which are disturbing elements on this earth. Your prowess never deteriorates. You are the proprietor of the transcendental abode, and You descend to relieve the distresses of the cows, the brāhmaṇas, and the devotees, You possess all mystic powers, and You are the preceptor of the entire universe. You are the almighty God, and I offer You my respectful obeisances.
(Prayers by Queen Kunti—Śrīmad-Bhāgavatam 1.8.43)
…When Kuntī prays, go-dvija-surārti-harāvatāra, she indicates that Govinda, Kṛṣṇa, descends to this world especially to protect the cows, the brāhmaṇas, and the devotees. The demoniac in this world are the greatest enemies of the cows, for they maintain hundreds and thousands of slaughterhouses. Although the innocent cows give milk, the most important food, and although even after death the cows give their skin for shoes, people are such rascals that they kill the cows, but still they want to be happy in this world. How sinful they are.
…Why is cow protection so much advocated? Because the cow is the most important animal….Nonetheless, the present human society is so ungrateful that they needlessly kill these innocent cows.
Kṛṣṇa is worshiped with this prayer:
namo brahmaṇya-devāya
go-brāhmaṇa-hitāya ca
jagad-dhitāya kṛṣṇāya
govindāya namo namaḥ
“My Lord, You are the well-wisher of the cows and the brāhmaṇas, and You are the well-wisher of the entire human society and world.” For perfect human society there must be protection of go-dvija—the cows and the brāhmaṇas.
The Hare Krishna Movement 