This is the best summary I could come up with:

Animal Outlook’s investigator said the farm had begun using feedback because some piglets were getting sick with diarrhea, losing weight, and their skin was turning from pink to a grayish hue.

Some pig researchers say that while feedback has clear benefits in fighting, for example, PEDv — a virus that caused hundreds of millions of dollars in economic loss to the pork industry a decade ago — it can be risky, and there’s no standard protocol.

Jim Reynolds, a bovine veterinarian in California who’s also worked with pigs and specializes in epidemiology, said the practice makes sense in theory, but he doesn’t recommend it in part because it risks exposing animals to unintended diseases.

That much was evident in the early 2010s fight over so-called pink slime, a mix of meat scraps processed with chemicals meant to kill bacteria, that was turned into filler for beef products.

While feedback may be particularly off-putting, it’s a symptom of a larger problem: America’s enduring desire for cheap, plentiful meat, which has given way to thousands of massive factory farms where stressed, genetically identical animals with poor immune systems are tightly packed together, providing the perfect conditions for disease to spread.

Industry has responded to consumer concerns with the practices brought to light in undercover investigations largely with empty gestures, like firing individual employees for abuse instead of meaningfully changing conditions for animals.

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