Not an injury. Not an accident. Something done on purpose.

And yet, this practice has existed for nearly a century—used by scientists, veterinarians, and farmers around the world.

So what exactly are cow portholes… and why do they exist?

🐄 What Are Cow Portholes?

A cow with a “porthole” is known as a cannulated cow.

This means a surgical device—called a cannula—is placed into the cow’s stomach area.

👉 It creates a small, sealed opening that gives direct access to the cow’s digestive system.

Think of it like a window into how a cow processes food.

Key takeaway: It’s not random—it’s done for research and medical purposes.
🧪 Why Do Scientists Use This Method?

The main goal is simple:

👉 To understand how cows digest food.

With direct access, researchers can:

Study digestion in real time
Analyze microbes inside the rumen
Test different diets
Improve feed efficiency
This helps farmers:

Increase milk production
Improve animal health
Reduce environmental impact (like methane emissions)
📜 A Practice That Dates Back Nearly 100 Years
This isn’t new.

The first documented use of cow cannulation dates back to 1928, when researchers began exploring digestion more closely.

Over time, it became a standard method in agricultural science.

👉 Because it provides data that’s hard to get any other way.