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Killing cows (BG and SB)

Expressions researched:
"cow cannot be killed" |"cow is never to be killed" |"cow killing" |"cow should never be killed" |"cow was about to be killed" |"cow-killer" |"cow-killing" |"cows are being killed" |"cows are not protected, but instead indiscriminately killed" |"cows will be abandoned or killed" |"kill a cow" |"kill cows" |"kill innocent animals like the cow" |"kill the innocent animals, especially the cows and the bulls" |"killed a cow" |"killed the cow" |"killing a cow" |"killing a woman, a cow or a brahmana" |"killing bulls and cows" |"killing of cows" |"killing the cow" |"killing the cows"

Bhagavad-gita As It Is

BG Chapters 13 - 18

Of all kinds of animal killing, the killing of cows is most vicious because the cow gives us all kinds of pleasure by supplying milk.
BG 14.16, Purport:

A human being has no need to kill animals, because God has supplied so many nice things. If one indulges in meat-eating anyway, it is to be understood that he is acting in ignorance and is making his future very dark. Of all kinds of animal killing, the killing of cows is most vicious because the cow gives us all kinds of pleasure by supplying milk. Cow slaughter is an act of the grossest type of ignorance. In the Vedic literature (Ṛg Veda 9.46.4) the words gobhiḥ prīṇita-matsaram indicate that one who, being fully satisfied by milk, is desirous of killing the cow is in the grossest ignorance.

In modern human society, spiritual knowledge is neglected, and cow killing is encouraged. It is to be understood, then, that human society is advancing in the wrong direction and is clearing the path to its own condemnation.
BG 14.16, Purport:

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. In modern human society, spiritual knowledge is neglected, and cow killing is encouraged. It is to be understood, then, that human society is advancing in the wrong direction and is clearing the path to its own condemnation.

Srimad-Bhagavatam

SB Preface and Introduction

The Lord raised the question of cow-killing, and the Kazi properly answered Him by referring to the Koran.
SB Introduction:

The Lord raised the question of cow-killing, and the Kazi properly answered Him by referring to the Koran. In turn the Kazi also questioned the Lord about cow sacrifice in the Vedas, and the Lord replied that such sacrifice as mentioned in the Vedas is not actually cow-killing. In that sacrifice an old bull or cow was sacrificed for the sake of receiving a fresh younger life by the power of Vedic mantras. But in the Kali-yuga such cow sacrifices are forbidden because there are no qualified brāhmaṇas capable of conducting such a sacrifice. In fact, in Kali-yuga all yajñas (sacrifices) are forbidden because they are useless attempts by foolish men.

SB Canto 1

Lord Buddha rejected Vedic philosophy outwardly because the sura-dviṣa, or the demons who are always envious of the devotees of Godhead, try to support cow-killing or animal-killing from the pages of the Vedas, and this is now being done by the modernized sannyāsīs.
SB 1.3.24, Purport:

Technically Lord Buddha's philosophy is called atheistic because there is no acceptance of the Supreme Lord and because that system of philosophy denied the authority of the Vedas. But that is an act of camouflage by the Lord. Lord Buddha is the incarnation of Godhead. As such, he is the original propounder of Vedic knowledge. He therefore cannot reject Vedic philosophy. But he rejected it outwardly because the sura-dviṣa, or the demons who are always envious of the devotees of Godhead, try to support cow-killing or animal-killing from the pages of the Vedas, and this is now being done by the modernized sannyāsīs. Lord Buddha had to reject the authority of the Vedas altogether. This is simply technical, and had it not been so he would not have been so accepted as the incarnation of Godhead. Nor would he have been worshiped in the transcendental songs of the poet Jayadeva, who is a Vaiṣṇava ācārya. Lord Buddha preached the preliminary principles of the Vedas in a manner suitable for the time being (and so also did Śaṅkarācārya) to establish the authority of the Vedas. Therefore both Lord Buddha and Ācārya Śaṅkara paved the path of theism, and Vaiṣṇava ācāryas, specifically Lord Śrī Caitanya Mahāprabhu, led the people on the path towards a realization of going back to Godhead.

Mahārāja Parīkṣit's activities are also wonderful because he chastised Kali, who was attempting to kill a cow.
SB 1.4.9, Purport:

The birth of Mahārāja Parīkṣit is wonderful because in the womb of his mother he was protected by the Personality of Godhead Śrī Kṛṣṇa. His activities are also wonderful because he chastised Kali, who was attempting to kill a cow. To kill cows means to end human civilization. He wanted to protect the cow from being killed by the great representative of sin. His death is also wonderful because he got previous notice of his death, which is wonderful for any mortal being, and thus he prepared himself for passing away by sitting down on the bank of the Ganges and hearing the transcendental activities of the Lord. During all the days he heard Bhāgavatam, he did not take food or drink, nor did he sleep a moment. So everything about him is wonderful, and his activities are worth hearing attentively. Desire is expressed herein to hear about him in detail.

The Emperor would not allow slaughterhouses or killing of cows. He was not a foolish and partial administrator who would arrange for the protection of one living being and allow another to be killed.
SB 1.4.12, Purport:

A devotee of the Lord automatically has all good qualifications. And the Emperor was a typical example of this. Personally he had no attachment for all the worldly opulences in his possession. But since he was king for the all-around welfare of his citizens, he was always busy in the welfare work of the public, not only for this life, but also for the next. He would not allow slaughterhouses or killing of cows. He was not a foolish and partial administrator who would arrange for the protection of one living being and allow another to be killed. Because he was a devotee of the Lord, he knew perfectly well how to conduct his administration for everyone's happiness—men, animals, plants and all living creatures. He was not selfishly interested. Selfishness is either self-centered or self-extended. He was neither. His interest was to please the Supreme Truth, Personality of Godhead.

Why should men kill cows for their selfish purposes? Why should man not be satisfied with grains, fruits and milk, which, combined together, can produce hundreds and thousands of palatable dishes.
SB 1.10.4, Purport:

It is said here that the cows used to moisten the pasturing land with milk because their milk bags were fatty and the animals were joyful. Do they not require, therefore, proper protection for a joyful life by being fed with a sufficient quantity of grass in the field? Why should men kill cows for their selfish purposes? Why should man not be satisfied with grains, fruits and milk, which, combined together, can produce hundreds and thousands of palatable dishes. Why are there slaughterhouses all over the world to kill innocent animals? Mahārāja Parīkṣit, grandson of Mahārāja Yudhiṣṭhira, while touring his vast kingdom, saw a black man attempting to kill a cow. The King at once arrested the butcher and chastised him sufficiently.

Mahārāja Parīkṣit was actually an ideal saintly king because while touring his kingdom he happened to see that a poor cow was about to be killed by the personified Kali, whom he at once took to task as a murderer.
SB 1.12.19, Purport:

The living entity thus transmigrates from one body to another in 8,400,000 species of life. But due to his being the part and parcel of the Lord, he not only is maintained with all necessaries of life by the Lord, but also is protected by the Lord and His representatives, the saintly kings. These saintly kings give protection to all the prajās, or living beings, to live and to fulfill their terms of imprisonment. Mahārāja Parīkṣit was actually an ideal saintly king because while touring his kingdom he happened to see that a poor cow was about to be killed by the personified Kali, whom he at once took to task as a murderer. This means that even the animals were given protection by the saintly administrators, not from any sentimental point of view, but because those who have taken their birth in the material world have the right to live. All the saintly kings, beginning from the King of the sun globe down to the King of the earth, are so inclined by the influence of the Vedic literatures.

Mahārāja Parīkṣit wanted to kill the personified Kali, who was attempting to kill a cow, the emblem of peace and religion.
SB 1.12.26, Purport:

In the line of royal succession in the family of Mahārāja Yudhiṣṭhira, all the kings, without exception, were the wisest men of their times, and so also it is foretold about Mahārāja Parīkṣit and his son Mahārāja Janamejaya, who was yet to be born. Such wise kings can become chastisers of upstarts and uprooters of Kali, or quarrelsome elements. As will be clear in the chapters ahead, Mahārāja Parīkṣit wanted to kill the personified Kali, who was attempting to kill a cow, the emblem of peace and religion. The symptoms of Kali are (1) wine, (2) women, (3) gambling and (4) slaughterhouses. Wise rulers of all states should take lessons from Mahārāja Parīkṣit in how to maintain peace and morality by subduing the upstarts and quarrelsome people who indulge in wine, illicit connection with women, gambling and meat-eating supplied by regularly maintained slaughterhouses.

The mlecchas, however, make plans to install slaughterhouses for killing bulls and cows along with other animals, thinking that they will prosper by increasing the number of factories.
SB 1.16.20, Purport:

When the sun-god is pleased, he properly collects water from the sea, and thus sufficient clouds collect on the horizon and rains fall. After sufficient rains fall, there is sufficient production of grains for men and all animals, and thus there is energy in the living being for progressive activity. The mlecchas, however, make plans to install slaughterhouses for killing bulls and cows along with other animals, thinking that they will prosper by increasing the number of factories and live on animal food without caring for performance of sacrifices and production of grains. But they must know that even for the animals they must produce grass and vegetables, otherwise the animals cannot live. And to produce grass for the animals, they require sufficient rains. Therefore they have to depend ultimately on the mercy of the demigods like the sun-god, Indra and Candra, and such demigods must be satisfied by performances of sacrifice.

The principal business of such non-kṣatriya rulers will be to kill the innocent animals, especially the cows and the bulls, who shall be unprotected by their masters, the bona fide vaiśyas, the mercantile community.
SB 1.17.1, Purport:

The principal sign of the age of Kali is that lower-caste śūdras, i.e., men without brahminical culture and spiritual initiation, will be dressed like administrators or kings, and the principal business of such non-kṣatriya rulers will be to kill the innocent animals, especially the cows and the bulls, who shall be unprotected by their masters, the bona fide vaiśyas, the mercantile community. In the Bhagavad-gītā (18.44), it is said that the vaiśyas are meant to deal in agriculture, cow protection and trade. In the age of Kali, the degraded vaiśyas, the mercantile men, are engaged in supplying cows to slaughterhouses. The kṣatriyas are meant to protect the citizens of the state, whereas the vaiśyas are meant to protect the cows and bulls and utilize them to produce grains and milk. The cow is meant to deliver milk, and the bull is meant to produce grains. But in the age of Kali, the śūdra class of men are in the posts of administrators, and the cows and bulls, or the mothers and the fathers, unprotected by the vaiśyas, are subjected to the slaughterhouses organized by the śūdra administrators.

The associates of the age of Kali take advantage of this lawless kingdom and arrange to kill innocent animals like the cow in secluded slaughterhouses.
SB 1.17.6, Purport:

In a civilization where God is conspicuously banished, and there is no devotee warrior like Arjuna, the associates of the age of Kali take advantage of this lawless kingdom and arrange to kill innocent animals like the cow in secluded slaughterhouses. Such murderers of animals stand to be condemned to death by the order of a pious king like Mahārāja Parīkṣit. For a pious king, the culprit who kills an animal in a secluded place is punishable by the death penalty, exactly like a murderer who kills an innocent child in a secluded place.

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.
SB 1.17.9, Purport:

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.

SB Canto 3

When the personification of Kali attempted to kill a cow, Mahārāja Parīkṣit at once prepared himself to kill the miscreant, and the personification of Kali was banished from his kingdom
SB 3.6.31, Purport:

The modern democratic state, which has no kṣatriyas, is a government of the vaiśyas and śūdras, and not of brāhmaṇas and kṣatriyas as formerly. Mahārāja Yudhiṣṭhira and his grandson, Mahārāja Parīkṣit, were typical kṣatriya kings, for they gave protection to all men and animals. When the personification of Kali attempted to kill a cow, Mahārāja Parīkṣit at once prepared himself to kill the miscreant, and the personification of Kali was banished from his kingdom. That is the sign of puruṣa, or the representative of Lord Viṣṇu. According to Vedic civilization, a qualified kṣatriya monarch is given the respect of the Lord because he represents the Lord by giving protection to the prajās. Modern elected presidents cannot even give protection from theft cases, and therefore one has to take protection from an insurance company. The problems of modern human society are due to the lack of qualified brāhmaṇas and kṣatriyas and the overinfluence of the vaiśyas and śūdras by so-called general franchise.

SB Canto 4

Since a cow is never to be killed, mother earth thought it wise to take the shape of a cow in order to avoid King Pṛthu's arrows.
SB 4.17.15, Purport:

Just as a mother produces various children, both male and female, the womb of mother earth produces all kinds of living entities in various shapes. Thus it is possible for mother earth to take on innumerable shapes. At this time, in order to avoid the wrath of King Pṛthu, she took the shape of a cow. Since a cow is never to be killed, mother earth thought it wise to take the shape of a cow in order to avoid King Pṛthu's arrows. King Pṛthu, however, could understand this fact, and therefore he did not stop chasing the cow-shaped earth.

SB Canto 5

Unfortunately, in modern civilization, men are busy killing the cows that are the source of yogurt, milk and ghee, they are cutting down all the trees that supply honey, and they are opening factories to manufacture nuts, bolts, automobiles and wine instead of engaging in agriculture.
SB 5.16.25, Purport:

This verse hints at the perfection of human society even within this material world. The miserable conditions of this material world can be corrected by a sufficient supply of milk, yogurt, honey, ghee, molasses, food grains, ornaments, bedding, sitting places and so on. This is human civilization. Ample food grains can be produced through agricultural enterprises, and profuse supplies of milk, yogurt and ghee can be arranged through cow protection. Abundant honey can be obtained if the forests are protected. Unfortunately, in modern civilization, men are busy killing the cows that are the source of yogurt, milk and ghee, they are cutting down all the trees that supply honey, and they are opening factories to manufacture nuts, bolts, automobiles and wine instead of engaging in agriculture. How can the people be happy? They must suffer from all the misery of materialism. Their bodies become wrinkled and gradually deteriorate until they become almost like dwarves, and a bad odor emanates from their bodies because of unclean perspiration resulting from eating all kinds of nasty things. This is not human civilization. If people actually want happiness in this life and want to prepare for the best in the next life, they must adopt a Vedic civilization. In a Vedic civilization, there is a full supply of all the necessities mentioned above.

SB Canto 6

Those who desire to eat meat may satisfy the demands of their tongues by eating lower animals, but they should never kill cows, who are actually accepted as the mothers of human society because they supply milk.
SB 6.4.9, Purport:

By nature's law, or the arrangement of the Supreme Personality of Godhead, one kind of living entity is eatable by other living entities. As mentioned herein, dvi-padāṁ ca catuṣ-padaḥ: the four-legged animals (catuṣ-padaḥ), as well as food grains, are eatables for human beings (dvi-padām). These four-legged animals are those such as deer and goats, not cows, which are meant to be protected. Generally the men of the higher classes of society—the brāhmaṇas, kṣatriyas and vaiśyas—do not eat meat. Sometimes kṣatriyas go to the forest to kill animals like deer because they have to learn the art of killing, and sometimes they eat the animals also. Śūdras, too, eat animals such as goats. Cows, however, are never meant to be killed or eaten by human beings. In every śāstra, cow killing is vehemently condemned. Indeed, one who kills a cow must suffer for as many years as there are hairs on the body of a cow. Manu-saṁhitā says, pravṛttir eṣā bhūtānāṁ nivṛttis tu mahā-phalā: we have many tendencies in this material world, but in human life one is meant to learn how to curb those tendencies. Those who desire to eat meat may satisfy the demands of their tongues by eating lower animals, but they should never kill cows, who are actually accepted as the mothers of human society because they supply milk. The śāstra especially recommends, kṛṣi-go-rakṣya: the vaiśya section of humanity should arrange for the food of the entire society through agricultural activities and should give full protection to the cows, which are the most useful animals because they supply milk to human society.

Even by a glimpse of the chanting of Nārāyaṇa's name, one becomes free from all the sinful reactions of killing a woman, a cow or a brāhmaṇa.
SB 6.13 Summary:

When all the demigods requested Indra to kill Vṛtrāsura, he refused because Vṛtrāsura was a brāhmaṇa. The demigods, however, encouraged Indra not to fear killing him because Indra was protected by the Nārāyaṇa-kavaca, or the Supreme Personality of Godhead Himself, Lord Nārāyaṇa. Even by a glimpse of the chanting of Nārāyaṇa's name, one becomes free from all the sinful reactions of killing a woman, a cow or a brāhmaṇa. The demigods advised Indra to perform an aśvamedha sacrifice, by which Nārāyaṇa would be pleased, for the performer of such a sacrifice is not implicated in sinful reactions even if he kills the entire universe.

One who has killed a cow or one who has killed his father, mother or spiritual master can be immediately freed from all sinful reactions simply by chanting the holy name of Lord Nārāyaṇa.
SB 6.13.8-9, Translation:

One who has killed a brāhmaṇa, one who has killed a cow or one who has killed his father, mother or spiritual master can be immediately freed from all sinful reactions simply by chanting the holy name of Lord Nārāyaṇa. Other sinful persons, such as dog-eaters and caṇḍālas, who are less than śūdras, can also be freed in this way. But you are a devotee, and we shall help you by performing the great horse sacrifice. If you please Lord Nārāyaṇa in that way, why should you be afraid? You will be freed even if you kill the entire universe, including the brāhmaṇas, not to speak of killing a disturbing demon like Vṛtrāsura.

Instead of killing the cow to eat flesh, civilized men must prepare various milk products that will enhance the condition of society.
SB 6.18.52, 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.

SB Canto 7

Because the Vedic civilization is lost, cows are not protected, but instead indiscriminately killed in slaughterhouses.
SB 7.2.12, Purport:

The picture of a proper human civilization is indirectly described here. In a perfect human civilization there must be a class of men fully trained as perfect brāhmaṇas. Similarly, there must be kṣatriyas to rule the country very nicely according to the injunctions of the śāstras, and there must be vaiśyas who can protect the cows. The word gāvaḥ indicates that cows should be given protection. Because the Vedic civilization is lost, cows are not protected, but instead indiscriminately killed in slaughterhouses. Such are the acts of demons. Therefore this is a demoniac civilization. The varṇāśrama-dharma mentioned here is essential for human civilization. Unless there is a brāhmaṇa to guide, a kṣatriya to rule

SB Canto 9

Pṛṣadhra unfortunately, when he finally approached the tiger, he could not distinguish between the cow and the tiger in the dark, and thus he killed the cow.
SB 9.2 Summary:

Following the order of his spiritual master, he would stand in this way for the entire night. Once, in the darkness of night, a tiger seized a cow from the cowshed, and when Pṛṣadhra came to know this, he took a sword in his hand and followed the tiger. Unfortunately, when he finally approached the tiger, he could not distinguish between the cow and the tiger in the dark, and thus he killed the cow. Because of this, his spiritual master cursed him to take birth in a śūdra family, but Pṛṣadhra practiced mystic yoga, and in bhakti-yoga he worshiped the Supreme Personality of Godhead. Then he voluntarily entered a blazing forest fire, thus relinquishing his material body and going back home, back to Godhead.

In the morning Pṛṣadhra saw that he had killed the cow.
SB 9.2.8, Translation:

In the morning, when Pṛṣadhra, who was quite able to subdue his enemy, saw that he had killed the cow although at night he thought he had killed the tiger, he was very unhappy.

Killing him would be like destroying the embryo within the womb or killing a cow.
SB 9.9.31, Translation:

You are well known and worshiped in learned circles. How dare you kill this brāhmaṇa, who is a saintly, sinless person, well versed in Vedic knowledge? Killing him would be like destroying the embryo within the womb or killing a cow.

Destroying the undeveloped embryo of the soul in the womb is as sinful as killing a cow or a brāhmaṇa.
SB 9.9.31, Purport:

According to Vedic culture, destroying the undeveloped embryo of the soul in the womb is as sinful as killing a cow or a brāhmaṇa. In the embryo, the living entity is present in an undeveloped stage. The modern scientific theory that life is a combination of chemicals is nonsense; scientists cannot manufacture living beings, even like those born from eggs. The idea that scientists can develop a chemical situation resembling that of an egg and bring life from it is nonsensical. Their theory that a chemical combination can have life may be accepted, but these rascals cannot create such a combination. This verse refers to bhrūṇasya vadham—the killing of a bhrūṇa or destruction of the embryo.

SB Canto 10.1 to 10.13

Two classes of men, however, will never be interested in hearing the message of Bhagavad-gītā and Śrīmad-Bhāgavatam - those who are determined to commit suicide and those determined to kill cows and other animals for the satisfaction of their own tongues.
SB 10.1.4, Purport:

Two classes of men, however, will never be interested in hearing the message of Bhagavad-gītā and Śrīmad-Bhāgavatam—those who are determined to commit suicide and those determined to kill cows and other animals for the satisfaction of their own tongues. Although such persons may make a show of hearing Śrīmad-Bhāgavatam at a Bhāgavata-saptāha, this is but another creation of the karmīs, who cannot derive any benefit from such a performance. The word paśu-ghnāt is important in this connection. paśu-ghna means "butcher." Persons fond of performing ritualistic ceremonies for elevation to the higher planetary systems must offer sacrifices (yajñas) by killing animals. Lord Buddhadeva therefore rejected the authority of the Vedas because his mission was to stop animal sacrifices, which are recommended in Vedic ritualistic ceremonies.

nindasi yajña-vidher ahaha śruti-jātaṁ
sa-daya-hṛdaya darśita-paśu-ghātaṁ
keśava dhṛta-buddha-śarīra jaya jagadīśa hare
(Gīta-govinda)

Even though animal sacrifices are sanctioned in Vedic ceremonies, men who kill animals for such ceremonies are considered butchers. Butchers cannot be interested in Kṛṣṇa consciousness, for they are already materially allured. Their only interest lies in developing comforts for the temporary body.

According to Vedic principles, a brāhmaṇa, an old man, a woman, a child or a cow cannot be killed under any circumstances.
SB 10.1.37, Purport:

According to Vedic principles, a brāhmaṇa, an old man, a woman, a child or a cow cannot be killed under any circumstances. Vasudeva stressed that Devakī was not only a woman but a member of Kaṁsa s family. Because she was now married to Vasudeva, she was para-strī, another man's wife, and if such a woman were killed, not only would Kaṁsa be implicated in sinful activities, but his reputation as king of the Bhoja dynasty would be damaged. Thus Vasudeva tried in many ways to convince Kaṁsa in order to stop him from killing Devakī.

According to Vedic principles, a woman, a brāhmaṇa, an old man, a child and a cow should never be killed.
SB 10.2.21, Purport:

According to Vedic principles, a woman, a brāhmaṇa, an old man, a child and a cow should never be killed. It appears that Kaṁsa, although a great enemy of the Supreme Personality of Godhead, was aware of the Vedic culture and conscious of the fact that the soul transmigrates from one body to another and that one suffers in the next life according to the karmas of this life. Therefore he was afraid of killing Devakī, since she was a woman, she was his sister, and she was pregnant. A kṣatriya becomes famous by performing heroic acts. But what would be heroic about killing a woman who, while confined in his custody, was under his shelter? Therefore, he did not want to act drastically by killing Devakī.

At the present moment, the killing of cows and the killing of children is going on unrestrictedly, and therefore this civilization is not at all human, and those who are conducting this condemned civilization are uncivilized asuras.
SB 10.3.22, Purport:

Kaṁsa has here been described as asabhya, meaning "uncivilized" or "most heinous," because he killed the many children of his sister. When he heard the prophecy that he would be killed by her eighth son, this uncivilized man, Kaṁsa, was immediately ready to kill his innocent sister on the occasion of her marriage. An uncivilized man can do anything for the satisfaction of his senses. He can kill children, he can kill cows, he can kill brāhmaṇas, he can kill old men; he has no mercy for anyone. According to the Vedic civilization, cows, women, children, old men and brāhmaṇas should be excused if they are at fault. But asuras, uncivilized men, do not care about that. At the present moment, the killing of cows and the killing of children is going on unrestrictedly, and therefore this civilization is not at all human, and those who are conducting this condemned civilization are uncivilized asuras.

Such uncivilized men are not in favor of the Kṛṣṇa consciousness movement. As public officers, they declare without hesitation that the chanting of the Hare Kṛṣṇa movement is a nuisance, although Bhagavad-gītā clearly says, satataṁ kīrtayanto māṁ yatantaś ca dṛḍha-vratāḥ (BG 9.14). According to this verse, it is the duty of the mahātmās to chant the Hare Kṛṣṇa mantra and try to spread it all over the world to the best of their ability. Unfortunately, society is in such an uncivilized state that there are so-called mahātmās who are prepared to kill cows and children and stop the Hare Kṛṣṇa movement. Such uncivilized activities were actually demonstrated in opposition to the Hare Kṛṣṇa movement's Bombay center, Hare Kṛṣṇa Land. As Kaṁsa was not expected to kill the beautiful child of Devakī and Vasudeva, the uncivilized society, although unhappy about the advancement of the Kṛṣṇa consciousness movement, cannot be expected to stop it. Yet we must face many difficulties in many different ways. Although Kṛṣṇa cannot be killed, Vasudeva, as the father of Kṛṣṇa, was trembling because in affection he thought that Kaṁsa would immediately come and kill his son.

Especially in this age, Kali-yuga, cows are being killed all over the world, and as soon as there is a movement to establish brahminical civilization, people in general rebel.
SB 10.4.41, Purport:
When Kṛṣṇa comes to establish real perfection in the social order, He personally gives protection to the cows and the brāhmaṇas (go-brāhmaṇa-hitāya ca). This is His first interest because without protection of the brāhmaṇas and the cows, there can be no human civilization and no question of happy, peaceful life. Asuras, therefore, are always interested in killing the brāhmaṇas and cows. Especially in this age, Kali-yuga, cows are being killed all over the world, and as soon as there is a movement to establish brahminical civilization, people in general rebel. Thus they regard the Kṛṣṇa consciousness movement as a form of "brainwashing." How can such envious persons be happy in their godless civilization? The Supreme Personality of Godhead punishes them by keeping them in darkness, birth after birth, and pushing them lower and lower into wretched conditions of hellish life. The Kṛṣṇa consciousness movement has started a brahminical civilization, but especially when it is introduced in the Western countries, the asuras try to impede it in many ways. Nonetheless, we must push forward this movement tolerantly for the benefit of human society.
Killing the cows and spoiling the land will not solve the problem of food.
SB 10.7.13-15, Purport:
There are four kinds of prasāda (catur-vidha). Salty, sweet, sour and pungent tastes are made with different types of spices, and the food is prepared in four divisions, called carvya, cūṣya, lehya and peya-prasāda that is chewed, prasāda that is licked, prasāda tasted with the tongue, and prasāda that is drunk. Thus there are many varieties of prasāda, prepared very nicely with grains and ghee, offered to the Deity and distributed to the brāhmaṇas and Vaiṣṇavas and then to the general public. This is the way of human society. Killing the cows and spoiling the land will not solve the problem of food. This is not civilization. Uncivilized men living in the jungle and being unqualified to produce food by agriculture and cow protection may eat animals, but a perfect human society advanced in knowledge must learn how to produce first-class food simply by agriculture and protection of cows.

SB Cantos 10.14 to 12 (Translations Only)

Cows will be abandoned or killed when they stop giving milk.
SB 12.3.36, Translation:
Servants will abandon a master who has lost his wealth, even if that master is a saintly person of exemplary character. Masters will abandon an incapacitated servant, even if that servant has been in the family for generations. Cows will be abandoned or killed when they stop giving milk.
Page Title:Killing cows (BG and SB)
Compiler:Labangalatika, ChrisF
Created:12 of Jan, 2011
Totals by Section:BG=2, SB=30, CC=0, OB=0, Lec=0, Con=0, Let=0
No. of Quotes:32