At first, it sounds unreal.
A hole… in a cow’s side?
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?
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