08/16/2026
Did you know that a cow’s “milk vein” is involved with one of the most time sensitive emergencies we see as food animal veterinarians?
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1759 (known around the barn as Jugular or Juggy for short) got herself in a precarious position this afternoon. Her farmer found her with a pool of blood underneath her when they went to fetch her for afternoon milking. Somehow Juggy got a hole in her subcutaneous abdominal vein (better known as the “milk vein”) and was losing blood quickly. The subcutaneous abdominal vein is a garden hose sized vessel located on the under side of the cow responsible for moving blood from the udder back to the heart. In mature lactating cows, around 500 L of blood passing through the mammary gland is required to produce 1 L of milk, meaning there is lots of blood that travels through these paired vessels every day. At any given time that vessel carries on average 3 L of blood per minute. For reference, the total blood volume of a 1200 lb cow is around 40 L. This means that without quick action a bleeding injury from this vessel could become catastrophic.
Luckily for Juggy, her farmers acted quickly and put a pressure bandage over the vessel and called for help. Thanks to their quick action, Dr. Mary was able to get there in time to repair the vessel with a few stitches and stop the bleeding for good. Now Juggy will need some TLC for the next few days while she heals, but she will make a full recovery. While she coincidentally has a large blood vessel themed name, we are very glad that we were able to help prevent bleeding out from one being her demise!