Imagine walking onto a farm and passing a cow… with a circular porthole on its side. No, it’s not a gadget from a science fiction movie or the fantasy of a quirky farmer. This small porthole actually allows you to directly observe the animal’s insides, and it has transformed certain farming practices. Why drill such a hole into a cow? What exactly does it do? The answer might just change your perception of animal husbandry and veterinary research.
A porthole on a cow? Yes, and it’s not a joke.
When we hear “porthole,” we naturally think of the round windows of an airplane or ship. However, in livestock farming, this word refers to a medical device called a ruminal fistula . Specifically, it’s an opening created in the cow’s flank, providing access to its rumen— one of its four digestive compartments.
This opening is held in place by a flexible ring, often made of plastic, similar to a safety cap . It allows researchers and veterinarians to observe, sample, or introduce substances into the rumen to better understand the digestion process.
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