It might sound shocking at first, but the practice often called “cow portholes” is actually a long-established scientific method known as cannulation. A cow with this feature is called a cannulated cow, meaning a surgically placed device (cannula) gives access to its rumen, one of its stomach compartments. The opening is sealed and carefully maintained, allowing experts to observe digestion directly.

The main purpose of this method is to better understand how cows process food. By accessing the rumen, scientists can study microbes, monitor digestion in real time, and test different diets. This helps improve feed efficiency, animal health, and even reduce environmental impact, such as methane emissions produced by livestock.

This is not a new or experimental idea. The practice dates back to around 1928, when researchers first began using cannulation to study digestion more closely. Over time, it became a standard and valuable method in agricultural science because it provides insights that are difficult to obtain in any other way.

Although it may seem unusual or concerning, the procedure is regulated and, when done properly, cows can continue to live normal and healthy lives. Still, it raises ethical questions, and some animal welfare advocates debate whether the benefits fully justify the practice. READ MORE BELOW