I found this small article on the 'Eat wild' website and half of me wanted to laugh, while the other half wanted to cry...
"In the "what will they think of next" category, feedlot nutritionists have been experimenting with substituting kitchen pot scrubbers for hay. Feedlot cattle need some roughage in their diet in addition to the grain concentrate or they will become sick and gain weight more slowly. But why bring in all that bulky hay, reasoned investigators, when pot scrubbers might do the trick? To test this novel idea, the scientists fed a group of steers a high-grain diet and then inserted either zero, four, or eight plastic scrubbers into each animal's rumen (stomach). The experiment appeared to work. "From day 113 to 152, steers provided with pot scrubbers had 16% greater average daily gain than those fed the 100% concentrate diet without pot scrubbers."
Wouldn't it be gratifying if the money spent on this questionable study had been spent on exploring the health benefits of raising animals on pasture?"