Mishnah Berurah Tiferet

Past Articles:

By: Zamir Cohen

Scientists Discover That There Are Emotional and Physiological Differences Between Kosher and Non-Kosher Animals!

Many have wondered: How is it possible that the Torah – which has bestowed upon humanity the universal values of sensitivity and compassion toward others – commands that the only acceptable way to prepare meat for consumption is through shechita, Jewish ritual slaughter?

This question is even more relevant, seeing that the Torah explicitly prohibits the infliction of needless pain on animals. This is evident, for example, in the commandment to relieve a beast struggling under its burden, even if it belongs to a personal enemy. The Talmud further states that, in the case of a suffering animal, it is forbidden to offer help on the condition of receiving payment, for the act must be done as quickly as possible. There are many similar laws on this topic.

Compassion being such an essential Jewish value, how can the Torah demand that people slaughter cattle with a knife, while prohibiting more commonly held practices, such as shooting the animal in the head with a bolt pistol, which is said to ensure a quicker, less painful death? Indeed, the Torah forbids us from knocking the animal unconscious in any way before it is killed, such as by striking it with a heavy object or stunning it with electric current – standard practices which are believed to lessen the animals’ suffering.

In previous generations it was widely accepted that the laws of shechita ensured the least pain and suffering for animals. For this reason, the Torah requires ritual slaughter to be performed with a completely smooth blade. Ritual slaughterers are required to inspect shechita knives carefully for proper sharpness. The slightest nick – which can be discerned by lightly running a fingernail across the blade deems the knife unfit for shechita and prohibits the consumption of any animals slaughtered with it.

Furthermore, Jewish law demands that shechita take place quickly, with one rapid movement of the knife. These requirements were created so that the animal would feel little or no pain in the process. Based upon the testimonies of individuals who have been inadvertently cut in a similar manner (such as a surgeon performing emergency medical treatment), a quick cut from a sharp knife is essentially painless. In fact, it is usually only after the blood starts flowing that the person realizes they have been cut. According to our Sages, it is the slaughtering methods of other cultures that cause the greatest levels of pain and suffering to animals.

This traditional Jewish perspective – convincing enough by itself –
has been greatly substantiated in recent times by an astounding series of experiments concerning the structure of the blood vessels and arteries in mammalian brains. These experiments erase all doubts about Jewish ritual slaughter, adding the topic of shechita to a long list of proofs of the Torah’s Divine origin.

At the base of the brain of all mammals rests a ring of blood vessels and arteries, creating a kind of “central station” for all of the blood flowing to the brain. This central station is known in humans as the Circle of Willis and in animals as the Rete Mirabile. Every physician knows that the sudden loss of blood pressure in this central component of the brain immediately leads to unconsciousness.

At the time of shechita, the carotid arteries, which carry blood through the neck to the brain, are severed. The instant the knife passes through these arteries, blood flow to the brain ceases, blood pressure drops rapidly, and the animal loses consciousness within two seconds, if not sooner!

This means that the animal feels no pain from this point forward. Shechita does not involve any pain for the animal, thanks to the sharpness of the knife, the quickness of the cut, and the immediate loss of consciousness.

On the other hand, non-halachic forms of slaughter undoubtedly cause pain to animals. Even numbing the animal with an electric shock, which supposedly prevents any feelings of pain, actually only “fries” the beast’s brain, and certainly causes unnecessary suffering. And of course, death through a bolt to the head surely engenders suffering in the animal, especially if delivered inaccurately, whether due to poor aim or an unexpected movement of the animal’s head. In these cases, levels of pain are far from minimized, and in fact, greater and unnecessary suffering may take place.

Though it is true that the body of an animal “jumps” after the loss of consciousness following shechita, research has shown this to be a mere muscle reflex, much like the movement of a lizard’s tail that has been severed from its body. An unattached tail, despite its involuntary, reflexive movement, certainly does not feel pain.

It would have been enough to end our discussion with these highly convincing points, but now we come to a true wonder. The carotid arteries carry blood to the brain from the front side of the neck. There are additional arteries at the back of the neck near the vertebrae of the spine, called the vertebral arteries. These arteries also link to the base of the brain, carrying blood to it. How, then, does shechita performed only from the front of the neck prevent animal suffering? Doesn’t blood continue to flow to the rete mirabile via the vertebral arteries? Yet Jewish law forbids cutting these arteries during shechita, lest one cut the vertebra – a circumstance forbidden in kosher slaughter.

Here modern research has made an incredible discovery!

While it is true that all mammals have front and back arteries, animals with cloven hooves that chew cud – meaning kosher animals – have a different structure in the arteries at the back of their neck. Whereas in non-kosher mammals, these arteries enter directly into the “central station” of the brain, in kosher mammals the rear arteries first connect to the front artery before entering the brain.

Most of the blood that reaches the brain flows through these front arteries. Thus shechita – performed on kosher animals only from the front – almost instantly halts blood flow to the brain. Here’s what happens: The blood that reaches the brain via the vertebral arteries immediately changes direction. It flows away from the brain, towards the point of least resistance and out via the opening from the cut. The result is an immediate drop in blood pressure and a loss of consciousness in the animal, providing total assurance that it feels no pain while shechita occurs.

To conclude, the answer to the question with which we began has a transcendental source. For who other than Gd could have produced this amazing physiological distinction between various mammals? Who other than Gd could have forged such a unique connection between halachically defined kosher animals and their physiological structure? Who other than Gd could have taught us how to slaughter these animals in a manner that inflicts no pain or suffering?

There is yet another difference between kosher and non-kosher animals. A study conducted in 1961 demonstrated that horses, dogs, and other animals resist being brought into slaughterhouses because they sense their approaching death. They become agitated, and may even kick and fight until they are killed. In kosher slaughterhouses, this phenomenon is almost non-existent.

For example, lambs present at the slaughter of other lambs do not show signs of fear. A calf allowed to roam freely during a period of shechita did not attempt to run away, even though the door of the slaughterhouse remained wide open. Cud-chewing animals will cease to ruminate when they are under stress. However, cows in a Jewish slaughterhouse may even sit and ruminate while members of their own species are being slaughtered around them!

Details of that study can be found in the book Shechita and Animal Suffering. Within its pages we learn that while a slaughtering knife can engender fear in a human being who understands its use and function, animals do not understand the significance of a knife and therefore do not fear it prior to slaughter. This logical conclusion was verified when a knife dipped in blood was shown to cattle. Not only did they fail to react to it, but one even licked the blood off the blade!

All of this indicates that not only do kosher animals not suffer during ritual slaughter, they do not even experience emotional discomfort before the act, and have absolutely no sense of their impending deaths.

Still, since there is always the possibility that one animal will be more sensitive than another, Jewish law forbids killing an animal in the presence of another, in order to prevent even the slightest chance of suffering to the one remaining alive.

It is also worth noting the medical opinion of Dr. Temple Grandin, a worldwide expert on proper livestock handling, who has developed various techniques to decrease animal suffering both on ranches and in the slaughterhouse. Dr. Grandin claims that the major suffering incurred by animals in the slaughterhouse is caused not by the moment of their being killed but by being improperly handled from the moment they arrive until their deaths. According to her findings, if cattle are handled properly, they reach the point of slaughter relaxed and well behaved. In the case of shechita, the actual slaughter is painless, because proper handling erases the possibility of animal suffering taking place.

There are still more benefits to our given method of shechita!

Meat slaughtered for consumption must be kept hygienic and safe throughout the duration of its storage. This is so for health reasons – to avoid food poisoning – and economic ones – so as not to needlessly waste food. In general, the better the meat and the fresher it can be kept, the less needs to be discarded and the fewer animals need to be slaughtered. According to some researchers, shechita ensures higher quality meat than other forms of slaughter. Shooting, for example, leaves an excess of blood in the carcass, due to the time lag between death and the bleeding of the carcass. This causes the meat to spoil faster. In other non-halachic methods of slaughter the situation is even worse.


It’s plain to see that proper shechita is not accompanied by pain and suffering. May that be a comfort as we eat the meat from the kosher animals that are permissible to us.

Rabbi Zamir Cohen is the founder of the Hidabroot organization. He has written several books on the topics of Jewish thought and law, including his national best seller, The Coming Revolution.