I have met a " Mr. Kong" who works in a chicken broiler feedstuff research unit in Bidor a few years back.
He did mention the need to add food supplements to improve quality of the meat, eggs.
As for cows, such nutrient addition must be needed to "improve the milk" and add value....
I don't know, just read from STAR Newspaper, alas, not another "fake news" again! ha ha ha
maybe bad quality cows in China.....ha ha ha