What Are Portholes, and Why Are They Used On Cows?
When you hear “portholes,” you might think of ships—but they’re also used on cows. Known as fistulas or cannulas, these surgically installed openings provide access to a cow’s stomach for research. Though controversial, this decades-old practice allows scientists to study digestion, improve feed, boost milk production, and reduce methane emissions. Used since the 1920s,…
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