There is also a prayer in the Vedic literature that states:
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." (Viṣṇu Purāṇa 1.19.65) The purport is that special mention is given in that prayer for the protection of the cows and the brāhmaṇas. Brāhmaṇas are the symbol of spiritual education, and cows are the symbol of the most valuable food; these two living creatures, the brāhmaṇas and the cows, must be given all protection—that is real advancement of civilization.
(Bhagavad-Gita----14:16----purport).

Protection of bulls and cows and all other animals can be possible only when there is a state ruled by an executive head like Mahārāja Parīkṣit. Mahārāja Parīkṣit addresses the cow as mother, for he is a cultured, twice-born, kṣatriya king. Surabhi is the name of the cows which exist in the spiritual planets and are especially reared by Lord Śrī Kṛṣṇa Himself. As men are made after the form and features of the Supreme Lord, so also the cows are made after the form and features of the surabhi cows in the spiritual kingdom. In the material world the human society gives all protection to the human being, but there is no law to protect the descendants of Surabhi, who can give all protection to men by supplying the miracle food, milk. But Mahārāja Parīkṣit and the Pāṇḍavas were fully conscious of the importance of the cow and bull, and they were prepared to punish the cow-killer with all chastisement, including death. There has sometimes been agitation for the protection of the cow, but for want of pious executive heads and suitable laws, the cow and the bull are not given protection. The human society should recognize the importance of the cow and the bull and thus give all protection to these important animals, following in the footsteps of Mahārāja Parīkṣit. For protecting the cows and brahminical culture, the Lord, who is very kind to the cow and the brāhmaṇas (go-brāhmaṇa-hitāya), will be pleased with us and will bestow upon us real peace.
(Srimad Bhagavatam----1:17:9----purport).

The Supreme Lord enjoins that brāhmaṇas and cows must be given all protection. The Lord is Himself very much inclined to do good to brāhmaṇas and cows (go-brāhmaṇa-hitāya ca). Mahārāja Parīkṣit knew all this, and thus he concluded that his insulting a powerful brāhmaṇa was certainly to be punished by the laws of the Lord, and he was expecting something very difficult in the very near future. He therefore desired the imminent calamity to fall on him and not on his family members. A man's personal misconduct affects all his family members. Therefore Mahārāja Parīkṣit desired the calamity to fall on him alone. By suffering personally he would be restrained from future sins, and at the same time the sin which he had committed would be counteracted so that his descendants would not suffer. That is the way a responsible devotee thinks. The family members of a devotee also share the effects of a devotee's service unto the Lord. Mahārāja Prahlāda saved his demon father by his personal devotional service. A devotee son in the family is the greatest boon or blessing of theLord.
(Srimad Bhagavatam----1:19:2----purport).

The Lord is always in favor of the brāhmaṇas and the cows, and therefore it is said, go-brāhmaṇa-hitāya ca. Lord Kṛṣṇa, or Viṣṇu, the Supreme Personality of Godhead, is also the worshipable Deity of the brāhmaṇas. In the Vedic literature, in the ṛg-mantra hymns of the Ṛg Veda, it is stated that those who are actually brāhmaṇas always look to the lotus feet of Viṣṇu: oṁ tad viṣṇoḥ paramaṁ padaṁ sadā paśyanti sūrayaḥ. Those who are qualified brāhmaṇas worship only the Viṣṇu form of the Supreme Personality of Godhead, which means Kṛṣṇa, Rāma and all Viṣṇu expansions. A so-called brāhmaṇa who is born in the family of brāhmaṇas but performs activities aimed against the Vaiṣṇavas cannot be accepted as a brāhmaṇa, because brāhmaṇa means Vaiṣṇava and Vaiṣṇava means brāhmaṇa. One who has become a devotee of the Lord is also a brāhmaṇa. The formula is brahma jānātīti brāhmaṇaḥ. A brāhmaṇa is one who has understood Brahman, and a Vaiṣṇava is one who has understood the Personality of Godhead.
(Srimad Bhagavatam----3:16:4----purport).

In Bhagavad-gītā it is stated by the Lord Himself that the acts and character of great authorities are followed by people in general. Leaders of ideal character are therefore needed in society. Kṛṣṇa, the Supreme Personality of Godhead, appeared in this material world just to show the example of perfect authority, and people have to follow His path. The Vedic injunction is that one cannot understand the Absolute Truth simply by mental speculation or logical argument. One has to follow the authorities. Mahājano yena gataḥ sa panthāḥ (CC.2:17:186). Great authorities should be followed; otherwise, if we simply depend on the scriptures, we are sometimes misled by rascals, or else we cannot understand or follow the different spiritual injunctions. The best path is to follow the authorities. The four brāhmaṇa-sages stated that Kṛṣṇa is naturally the protector of the cows and brāhmaṇas: go-brāhmaṇa-hitāya ca. When Kṛṣṇa was on this planet, He set a practical example. He was a cowherd boy, and He was very respectful to the brāhmaṇas and devotees.
(Srimad Bhagavatam----3:16:23----purport).

Kṣatriyas are specifically meant to maintain the brāhmaṇas because if the brāhmaṇas are protected, then the head of civilization is protected. Brāhmaṇas are supposed to be the head of the social body; if the head is clear and has not gone mad, then everything is in proper position. The Lord is described thus: namo brahmaṇya-devāya go-brāhmaṇa-hitāya ca. The purport of this prayer is that the Lord specifically protects the brāhmaṇas and the cows, and then He protects all other members of society (jagad-dhitāya). It is His will that universal welfare work depends on the protection of cows and brāhmaṇas; thus brahminical culture and cow protection are the basic principles for human civilization. Kṣatriyas are especially meant to protect the brāhmaṇas, as is the supreme will of the Lord: go-brāhmaṇa-hitāya ca. As, within the body, the heart is a very important part, so the brāhmaṇas are also the important element in human society. The kṣatriyas are more like the whole body; even though the whole body is bigger than the heart, the heart is more important.
(Srimad Bhagavatam----3:22:3----purport).

The Supreme Personality of Godhead is worshiped with the prayer namo brahmaṇya-devāya go-brāhmaṇa-hitāya ca. Thus it is clear that the Supreme Personality of Godhead respects and protects the brāhmaṇas and brahminical culture, as well as the cows; in other words, wherever there are brāhmaṇas and brahminical culture, there are cows and cow protection. In a society or civilization in which there are no brāhmaṇas or brahminical culture, cows are treated as ordinary animals and slaughtered, at the sacrifice of human civilization. The specific mention of the word gavām by Pṛthu Mahārāja is significant because the Lord is always associated with cows and His devotees. In pictures Lord Kṛṣṇa is always seen with cows and His associates such as the cowherd boys and the gopīs. Kṛṣṇa, the Supreme Personality of Godhead, cannot be alone. Therefore Pṛthu Mahārāja said, sānucaraś ca, indicating that the Supreme Personality of Godhead is always associated with His followers and devotees.
(Srimad Bhagavatam----4:21:44----purport).

From the instructions of Lord Brahmā it is understood that everyone should very faithfully worship the brāhmaṇas, the Supreme Personality of Godhead and the cows. The Supreme Personality of Godhead is go-brāhmaṇa-hitāya ca: He is always very kind to cows and brāhmaṇas. Therefore one who worships Govinda must satisfy Him by worshiping the brāhmaṇas and cows. If a government worships the brāhmaṇas, the cows and Kṛṣṇa, Govinda, it is never defeated anywhere; otherwise it must always be defeated and condemned everywhere. At the present moment, all over the world, governments have no respect for brāhmaṇas, cows and Govinda, and consequently there are chaotic conditions all over the world. In summary, although the demigods were very powerful in material opulence, the demons defeated them in battle because the demigods had behaved disrespectfully toward a brāhmaṇa, Bṛhaspati, who was their spiritual master.
(Srimad Bhagavatam----6:7:24----purport).

If one is trained to honor and worship the cows and brāhmaṇas, he is actually civilized. The worship of the Supreme Lord is recommended, and the Lord is very fond of the cows and brāhmaṇas (namo brahmaṇya-devāya go-brāhmaṇa-hitāya ca). In other words, a civilization in which there is no respect for the cows and brāhmaṇas is condemned. One cannot become spiritually advanced without acquiring the brahminical qualifications and giving protection to cows. Cow protection insures sufficient food prepared with milk, which is needed for an advanced civilization. One should not pollute civilization by eating the flesh of cows. A civilization must do something progressive, and then it is an Āryan civilization. Instead of killing the cow to eat flesh, civilized men must prepare various milk products that will enhance the condition of society. If one follows the brahminical culture, he will become competent in Kṛṣṇa consciousness.
(Srimad Bhagavatam----6:18:52----purport).

The Supreme Personality of Godhead generally appears in various types of incarnations to give protection to the cows and brāhmaṇas. The Lord is described as go-brāhmaṇa-hitāya ca; in other words, He is always eager to benefit the cows and brāhmaṇas. When Lord Kṛṣṇa appeared, He purposefully became a cowherd boy and showed personally how to give protection to the cows and calves. Similarly, He showed respect to Sudāmā Vipra, a real brāhmaṇa. From the Lord's personal activities, human society should learn how to give protection specifically to the brāhmaṇas and cows. Then the protection of religious principles, fulfillment of the aim of life and protection of Vedic knowledge can be achieved. Without protection of cows, brahminical culture cannot be maintained; and without brahminical culture, the aim of life cannot be fulfilled. The Lord, therefore, is described as go-brāhmaṇa-hitāya because His incarnation is only for the protection of the cows and brāhmaṇas. Unfortunately, because in Kali-yuga there is no protection of the cows and brahminical culture, everything is in a precarious position. If human society wants to be exalted, the leaders of society must follow the instructions of Bhagavad-gītā and give protection to the cows, the brāhmaṇas and brahminical culture.
(Srimad Bhagavatam----8:24:5----purport).

For the cowherd men and the cows, Kṛṣṇa is the supreme friend. Therefore He is worshiped by the prayer namo brahmaṇya-devāya go-brāhmaṇa-hitāya ca. His pastimes in Gokula, His dhāma, are always favorable to the brāhmaṇas and the cows. His first business is to give all comfort to the cows and the brāhmaṇas. In fact, comfort for the brāhmaṇas is secondary, and comfort for the cows is His first concern. Because of His presence, all people would overcome all difficulties and always be situated in transcendental bliss.
(Srimad Bhagavatam----10:8:16----purport).