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What Are Portholes, and Why Are They Used On Cows?

Cow “Portholes” Spark Ongoing Debate

Cows with stomach portholes—called fistulas—are used in research to study digestion and improve farming. Though in use since the 1920s and said to be safe long-term, critics call the practice invasive. Supporters say it boosts sustainability, but ethical concerns remain as alternatives emerge.

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