Kosher animals are slaughtered with a single, continuous cut across the throat using a razor-sharp knife, severing the major blood vessels, windpipe, and esophagus in one swift motion. This method, called shechita, is designed to cause a rapid drop in blood pressure to the brain, with research indicating the animal loses consciousness within approximately two seconds. The entire process, from the qualifications of the person making the cut to the inspection of the meat afterward, follows detailed religious law.
The Cut Itself
Shechita targets the ventral structures of the neck: both carotid arteries, both external jugular veins, the trachea (windpipe), and the esophagus. All of these are severed in a single continuous stroke. The incision must be made below the larynx but not too close to the chest, and it must be a clean cut, not a tear or laceration. The goal is to open all major blood vessels at once so blood drains rapidly and the animal loses consciousness as quickly as possible.
The dramatic fall in blood pressure to the brain after both carotid arteries are cut is what causes unconsciousness. One study published in the Israel Journal of Veterinary Medicine observed tongue prolapse, a reliable indicator of lost consciousness, occurring on average about 31 seconds after the cut, though the initial loss of cortical brain function happens much faster. Unlike conventional slaughter in most countries, shechita does not use a captive bolt or electrical stunning beforehand. The cut itself is intended to serve that function.
The Knife: Chalaf
The knife used for shechita, called a chalaf, has strict physical requirements. It must be perfectly smooth, razor-sharp, and completely free of nicks or serrations. Its length must be at least twice the width of the animal’s neck, which means different sizes for different species: roughly 14 to 16 cm for poultry, 25 cm for sheep and goats, and 40 to 45 cm for cattle.
Before and after every slaughter, the person performing the cut runs a fingernail along both sides of the blade’s edge to check for any roughness or imperfections. This inspection also happens between individual animals. If any nick is found on the blade after the cut, the meat from that animal is considered unfit for consumption. The reasoning is practical as well as religious: a perfectly smooth blade creates a cleaner incision, reducing tissue damage and pain.
Who Performs the Slaughter
Only a specially trained and certified individual called a shochet can perform shechita. Becoming one requires years of study covering Jewish slaughter law, animal anatomy, and pathology. A candidate must become thoroughly fluent in the relevant sections of religious legal codes and then serve an apprenticeship under an experienced shochet.
The training has a surprisingly physical dimension. A student must practice the cut in front of an expert until he can perform it without flinching or losing composure. If he faints or hesitates, the cut could be botched without him even realizing it. He must successfully complete the slaughter three consecutive times under supervision before being permitted to work independently. Beyond technical skill, the tradition also calls for strong tactile sensitivity in the fingers, since detecting a microscopic nick on a knife blade by touch alone requires sharp perception.
What Happens After the Cut
Kosher law prohibits consuming blood, so after slaughter the meat goes through a process to remove as much blood as possible. The carcass is soaked and then salted within 72 hours of slaughter. Coarse salt draws out residual blood from the tissue. This step is separate from the draining that happens during slaughter itself.
Certain parts of the animal are also removed entirely. The sciatic nerve and specific types of fat surrounding the internal organs (called chelev) are forbidden under Jewish law. The process of removing these parts is called nikkur, or porging. It requires skilled butchers with specialized knowledge of the anatomy. In practice, because this process is so labor-intensive for the hindquarters of cattle, many kosher producers in the United States simply sell the hindquarters to the non-kosher market rather than performing the removal.
Internal Inspection and the Meaning of “Glatt”
Even after a perfect cut by a qualified shochet, the animal can still be disqualified. Jewish law identifies 70 categories of injuries, diseases, or abnormalities, collectively called treifot, that render an animal non-kosher regardless of how it was slaughtered. This means every carcass undergoes an internal examination.
The lungs receive especially close scrutiny. Inspectors look for adhesions, which are bands of fibrous tissue that can form on the lung surface. These adhesions sometimes indicate a puncture in the lung wall underneath, and a punctured lung disqualifies the animal entirely. To test this, the inspector carefully removes the adhesion, inflates the lung with air, and submerges it in water. If air bubbles appear, the lung has a hole and the meat is declared treif (non-kosher).
This is where the term “glatt” comes in, and it doesn’t just mean “extra kosher” the way it’s often used casually. Technically, glatt kosher means the animal’s lungs had either no adhesions at all or only extremely thin, thread-like adhesions that peeled off easily and left no hole. The highest standard, called Beis Yosef Glatt, means the lungs were completely free of adhesions. Regular kosher (non-glatt) meat may have had thicker adhesions that were successfully removed without leaving a puncture and still passed the air-and-water test. Both are kosher, but glatt represents a stricter standard.
Why This Process Exists
The underlying principle of shechita is that if an animal is going to be killed for food, the method should cause the least possible suffering while also ensuring the meat is healthy and free of disease. The sharp, nick-free blade and the requirement for a single uninterrupted motion are meant to minimize pain. The post-slaughter inspections serve as an early form of meat quality control, screening out animals with lung disease, organ damage, or other conditions that might indicate the animal was unhealthy.
The rejection rate can be significant. Animals that fail lung inspection or show any of the 70 categories of disqualifying defects are removed from the kosher supply chain entirely. This means kosher certification isn’t just about how the animal dies. It’s a system that spans the slaughterer’s training, the condition of the blade, the technique of the cut, the health of the animal, and the preparation of the meat afterward.