5 weird and a little bit gross facts about a cow’s stomachs

Lots of people know that cows digest grass using four different chambers rather than a single stomach but here are some (warning: many of them are a bit gross) weird facts you might not have heard:

  1. A cow can produce up to a litre of gas (CO2 and methane) per minute. She’s not a farter though, she’s a burper!
  2. A cow can produce 150 litres or more of saliva in a day.
  3. The first two chambers – the reticulum and rumen – can hold a whopping 150 to 200 litres of solids and liquid in total.
  4. Actually, we’re not really feeding the cow but the bacteria and protozoa in her rumen, which use fermentation to digest 70–80% of the digestible dry matter in the rumen.
  5. The rumen has a pH of about 6 or 7, so isn’t a true stomach. It’s not until the feed reaches the fourth chamber, the abomasum, that the pH drops to 2 and acid digestion begins. This is the cow’s true stomach.

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