Just found out about this and thought that it needed to be shared - as it concerns the full extent of abuse:
The ruminal cannual - permanent access to a cow's stomach to analyse the feed process to maximise meat and milk production. Beyond repulsive and heartbreaking.
One can go
here and
here for more information.
At universities they use it to to easily check digestive fluids and bacteria in different parts of the stomach. Some veterinary groups do it to diagnose digestive issues in cows (they can test without having to poke or do surgery every single time the test is needed). It basically prevents the need for multiple pokes if multiple tests are going to be needed or done. The ports can also be used to put antibiotics directly into the part of the stomach needed, rather than risking wiping out the entire bacteria colony for all 4 sections of the stomach.
Any other cases, I don't know. I prefer the academia side of biology. I don't condone this for anything that isn't needed for the cow really. And in academia where it is used for research (which food is digested the best, and whatnot), I know that very strict standards are used, and as few animals (usually just 1) are used as possible. But to clarify quickly, I know what this is supposed to be used for. But unless those cows are sick that are lined up with them, I don't know what they are being used for in those situations.